This tiny island in the South China Sea is crawling with venomous sea snakes.

Costa Rica's best known combat zone, used during the Battle of Santa Rosa.

Along a coast that sees the annual migration of humpback whales, a geological formation that takes the shape of a whale’s tail.

There is a small island in the Gulf of Nicoya where the only human inhabitants are dead.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

A major pre-Columbian archaeological site in central El Salvador.

This museum dedicated to the history of the medical bone trade and human osteology.

At this farm in upstate New York, the former president plotted his reelection campaign.

It wouldn't be long after purchasing this farm, Brown would lead his siege on Harper's Ferry.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

This elaborate High Victorian Gothic structure is one of the world's few 16-sided buildings.

This Bronx apartment building is officially recognized as the birthplace of hip-hop.

The only remaining building in New York to see the inauguration of a president is being slowly overtaken by a grocery store.

A large boulder marks the place where the island of Manhattan was purportedly "sold" to the Dutch.

The studio of influential composer Charles Ives is perfectly reconstructed, hidden in the back of the American Academy of Arts and Letters.

Residents of this Brooklyn neighborhood may be unaware their houses sit atop a buried trolley graveyard.

Supremely flaky treats await at Amadou Ly’s boulangerie and patisserie.

More than 350 million years ago, western New York was covered in a vast sea. Today, you can dig up the remains of the plants and animals that lived there.

A small Second Empire-style building is one of only seven remaining lighthouses on the Hudson River.

The humble fort that saved Washington.

Surrounded by low rise buildings and partially converted into an auto body shop, this marble archway is the only vestige of a forgotten Manhattan estate.

Michael Jackson got Bad and Crocodile Dundee walked on heads in this iconic Brooklyn subway station.

During the American Revolution, this mansion hosted failed peace talks between the British and Americans.

This Catskills museum preserves stumps from the earliest known fossil forest on Earth.