Discover amazing things to do everywhere you go

The world’s famous Colosseum was built in 80 AD for the Roman emperors to stage fight to-the-death gladiator battles and hunt and kill wild animals, whilst members of the general public watched the violent spectaculars. Entry was free, although you were seated according to your social rank and wealth. Gladiatorial games were banned in 438 AD; the wild beast hunting continued until 523.

The Colosseum is amazing for its complex and advanced architecture and building technique. Despite being used as a quarry for building materials at various points in history, it is still largely intact. You can see the tiered seating, corridors and the underground rooms where the animals and gladiators awaited their fate. Today the Colosseum has set the model for all modern-day stadiums, the only difference being today's teams survive their games.

The Auschwitz concentration camp was established in April 1940 in the prewar Polish army barracks on the outskirts of Oświęcim. Originally intended for Polish political prisoners, the camp was 'repurposed ' as a dedicated center for the genocide of the Jews of Europe. For this purpose, the much larger camp at Birkenau (Brzezinka), also referred to as Auschwitz II, was built 2km west of the original site in 1941 and 1942, and another in Monowitz, several kilometers to the west. It is now estimated that this death factory eliminated some 1.6 million people of 27 nationalities, including 1.1 million Jews, 150,000 Poles and 23,000 Roma.

Auschwitz was only partially destroyed by the fleeing Nazis, and many of the original brick buildings stand to this day as a bleak testament to the camp's history. Some 13 of the 30 surviving prison blocks now house museum exhibitions, either general or dedicated to victims from particular countries or races that lost citizens at Auschwitz.

For almost 150 years, Alcatraz has given the innocent chills and the guilty cold sweats. Over the years it's been the nation's first military prison, then a forbidding maximum-security penitentiary, now a National Park. No wonder that first step you take off the ferry and onto 'The Rock' seems to cue ominous music: dunh-dunh-dunnnnh!

The trip to Alcatraz is popular and space is extremely limited. Purchase Alcatraz tickets as far in advance as possible, up to 90 days. The roster of Alcatraz inmates read like an America's Most Wanted list. A-list criminals doing time on Alcatraz included Chicago crime boss Al "Scarface" Capone, dapper kidnapper George "Machine Gun" Kelly, and hot-headed Harlem mafioso and sometime poet "Bumpy" Johnson. Though Alcatraz was considered escape-proof, in 1962 the Anglin brothers and Frank Morris floated away on a makeshift raft and were never seen again. A visit to Alcatraz is more than just seeing the inside of an old prison.

Mount Etna, on the island of Sicily, is Europe’s tallest active volcano. Not only that, it’s one of the world’s most active volcanoes and, as of 2013, is an UNESCO World Heritage Site. It is a small wonder, then, that this mountain has shaped much of Sicily’s past and continues to impact life on the island today.

The volcano sits near the eastern coast of Sicily, not far from the major port city of Catania. Eruptions from Mount Etna have been responsible for serious damage to cities and towns lying close to it, including one in 1669 that destroyed the villages that had been built on the mountainside. People continue to inhabit the mountain, however, partly because the rich volcanic soil makes an excellent base for crops. You’ll find not only fruits and vegetables growing on and around Mount Etna, but also grapes - there are many wines that owe their prominence to the volcano.

You can be forgiven for thinking that Halong Bay couldn’t possibly be a real place. After all, beauty like this only exists in movies, where high-tech equipment can create a landscape that is mesmerizing, awe-inspiring and perfect. Not only is Halong Bay real, however, but it’s a convenient side trip from fast-paced Hanoi that should be on the itinerary of any traveler passing through North Vietnam.

Classified as a UNESCO World Heritage site and one of the seven New Wonders of Nature, Halong Bay contains over 1,900 islands and jagged limestone islets. Cruise in silence on a traditional junk through the morning Halong Bay mists, and watch as vertical karst formations appear and then fade from view. In addition to the islands and turquoise waters, Halong Bay is riddled with grottoes that feel like hidden lairs. Dock the boat at Bo Hòn Island and descend into Sung Sot Cave, a 130,000-square-foot chamber that drips in dozens of stalactites.

Built by Gustave Eiffel for the 1889 World Fair, held to commemorate the centennial of the Revolution, the Eiffel Tower (Tour Eiffel) made headlines at the time as the world's tallest structure at 1,050 feet (320 meters). Initially opposed by Paris' artistic and literary elite, the tower was almost torn down in 1909, but its salvation came when it proved an ideal platform for the antennas needed for the new science of radiotelegraphy.

Today, the highlight of a visit is the supreme view over Paris. When you're done peering upward through the girders from the ground, head up to the three levels open to the public, one of which features the famed 58 Tour Eiffel Restaurant. Just southeast of the Eiffel Tower is a grassy expanse that served as the site of the world's first balloon flights. Today, the area is frequented by skateboarding teens and activists stating their views on the current state of France.

The holy grail for lovers of Inca monuments, the enigmatic lost city of Machu Picchu is the most famous archaeological site in all of South America.

The spectacular collection of temples, terraced hills and plazas was the mountain-top citadel of the Inca under Pachacutec and Tupac Yupanqui, until the coming of the Europeans with Pizarro. It may have the most familiar name, but Machu Picchu has refused to reveal many of its mysteries, including the secrets of its construction, function and demise. The overgrown ruins were discovered by US historian Hiram Bingham in 1911, and the quality of the stonework hints that it was an extremely important ceremonial site. The remains are thought to date from around 1450, built at the height of the Inca Empire, and as they escaped being plundered by the Spanish they include semi-intact icons and shrines that were defaced or removed at other sites.