The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Snack on a partially gestated duck egg.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

The most visited, and possibly most controversial, museum in Germany.

World's largest bell sits on the grounds of the Kremlin in Moscow.

Moscow's imposing monument to the Space Age.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

The final resting place of soldiers' loyal canine companions.

100 massive sculptures in the Hudson River Valley.

One man's swirling six-acre monument of stone.

Khmer Rouge's high security prison.

5,000 skulls in memorial to those killed by the Khmer Rouge.

A battle between nature and architecture in the Cambodian jungle.

Chewing gum tycoon's memorial lies perched over wife's botanical gardens on Santa Catalina Island.

Oldest building in California still in use.

A six-ton wedding present for the King of the Scots.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.