A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

A South African bar inside a hollowed out 6,000-year-old Baobab.

The oldest olive tree in Greece has been bearing fruit for at least 2,000 years.

The luxurious English estate houses the world’s largest private collection of French Rothschild wines.

Thousands of jack o'lanterns light up Halloween at this historic West Virginia home.

Whale bones, scrimshaw, and sperm oil make up just a part of this comprehensive collection of whaling history.

Why have you never heard of the second most popular tourist site in New York?

A collection of unique outdoor sculptures surounded by the beauty of nature.

Town full of spiritualists, some of whom are mediums, is still in full swing after 130 years.

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

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

An eccentric playboy's astounding natural history collection.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

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.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

An isolated beacon with a history of grisly murder and a view of some of literature's greatest inspirations.

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

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

A controversial magical figure is hidden within a diorama of the city.