Lyon's "Wall of the Silk Weavers" is one of the largest murals in Europe.

Life-sized painted illusions let pedestrians blend in with the street art.

Walk through a clothing store, across a courtyard, and up several flights of stairs for delicious coffee with a side of beautiful views.

Known for the tunnel that leads visitors to the water.

Hundreds of caves once used to store grains and animal feed.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

Giant pagoda houses the car that drove Thích Quảng Đức to his death by self-immolation.

A boat ride through utter darkness, lit only by headlamps, reveals an emerald green pool locals believe is sacred.

This network of tunnels housed an entire village for years, and even had a hall for screening movies.

World's largest cave was only discovered in 1991, and now offers tours to the public.

Villagers have recycled bomber fuel tanks from the Vietnam War and turned them into very, very strong boats.

Believed to have once stored either human remains or rice wine, thousands of mysterious stone jars lie in ruin.

Eat a meal surrounded by bomb fragments.

This striking landscape in northern Vietnam contains both geological and archaeological wonders.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.