An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

Gargantuan home of Russian science.

Moscow's imposing monument to the Space Age.

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

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

Former headquarters of the KGB.

A terrific purveyor of natural history objects and curios.

The most confusing clock in New York.

Elevated freight railway turned wildly successful urban park.

An artist's cute bronze subway sculptures belie his violent artistic past.

Commemorating the spot where the famous scientist fed his pigeons.

Slyly buy a shake in the Parker Meridien lobby.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."