The site of the climactic scene from the classic horror film is now a historic landmark.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

At 207 feet, one of the world's longest continuous escalators.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

An original apothecary from 1792.

A super-sized promotional trick that is now a D.C. landmark.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

Largest Roman Catholic church in North America.

Remnants of a storybook amusement park hidden behind a strip mall.

Museum dedicated to the terror regimes of Hungary.

Recently restored menagerie of Victorian-era beasts.

The design of the Palacio Salvo has been described as "a lighthouse on top of a building."

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

A crumbling hospital from the 1850s on Roosevelt Island.

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

The world's brightest bioluminescent bay.

A musical instrument played by the sea.

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