This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Famously misunderstood wonder of the ancient world

Scattered throughout London are ancient remnants of the city's former bounding wall.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Ancient serpentine sacrifice holder that has stood the test of time.

The ancient latrines of the Greeks, in all their public glory.

A marvel of Byzantine engineering under the streets of Istanbul.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

Japanese national treasure originally built in 593 CE.

Peace Park and the Atomic Bomb Dome.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

Pompeii's less famous neighbor is still revealing her secrets.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Erotic art covers the walls of the largest ancient pleasure palace.

A Japanese corporation has turned this small island town into living modern art gallery.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Roman ruins top white travertine terraces formed by ancient hot springs.

Elevated freight railway turned wildly successful urban park.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

This famous city eluded concrete detection until the early 2000's.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.