FDR's Art Deco hospital tower was hopelessly inefficient.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

The land is home to swimming ponies and a legendary 18th-century treasure.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

An ancient underground cultic temple where sunlight penetrates on the summer solstice.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

The fairy tale castle of the "fairy-tale king."

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

This Balinese sea temple is thought to be guarded by the hundreds of monkeys that live around it.

Bali's remote "gateway to heaven" is one of the most sacred places on the island.

Hindu temple of the dead home to hundreds of long-tailed macaques.

“The oddest pub in South Africa,” inspired by a practical joke.

The original goat tower, the one that started it all.

Largest cave system in Africa.

A massive underwater sinkhole made famous by Jacques Cousteau.

Sacred Buddhist home of some spiritual monkeys.