The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Whitewashed mosque contains the world's largest carpet.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

The world's largest frame offers spectacular views of the city's past and present.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

Billed as the "largest natural flower garden in the world" this Middle Eastern show field has little competition at 45 million flowers.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

One of the city’s oldest watering holes was originally the home of a famous James Brown (not that one).

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

According to a gruesome legend, an architect sacrificed his wife to build this spectacular, 16th-century cathedral.

The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

A gathering of green robots at the Googleplex.

A monument to one of the few Olympic flames ever to be lit outside of the host city.

Memorial stone for GWAR vocalist, depicted in his iconic costume.

Reforestation in action is the main attraction in this abandoned quarry.

In Cold Spring, New York, a shrine containing Godzilla and an assortment of plastic dinosaurs stands dedicated to a teenager who died in a car accident in 1996.

This abandoned ironworks was once the most important military supplier in America.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

This fancifully decorated Victorian home in New York’s Hudson Valley is the only known fully domed octagonal residence in the United States.

America's first wax museum opened in 1948.

A semi-scholarly approach to sex.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

In the middle of a busy airport, a statue honoring the astronaut who told Houston that Apollo 13 had a problem.