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

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The "Seinfeld" diner.

Elevated freight railway turned wildly successful urban park.

One of only two commuter aerial tramways in the United States.

A popular European tradition makes its way to the states on one of America's most famous bridges.

A crumbling hospital from the 1850s on Roosevelt Island.

This bazaar is one of the oldest in the Arabian world.

Every Friday, Sufi dervishes whirl around the tomb in a trance-like state as part of a sacred ritual called dhikr.

These Nubian pyramids are strange and unique, even by pyramid standards.

The largest prehistoric ruins south of the Sahara, once a powerful center of international trade.

Huge herds of Asian elephants can be seen walking, bathing, and just chilling at this Sri Lankan park.

Ancient cave temple near a massive Buddha statue.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

A gift from Scotland to the United States in memory of the 270 lives lost when Pan Am Flight 103 exploded over Lockerbie due to a terrorist bombing.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

Its unique collection details the history of the state's svelte railroads.

Monument to a brutal, ineffectual US bombing campaign and a sobering reminder of the human cost of the Vietnam War.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

Nelson Mandela lived here with his family from 1946 until his arrest in 1962.

This seemingly random 30-foot statue of an oryx in Qatar's capital was a mascot for the 2006 Asian Games.