This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

A little sculpture with a large wardrobe.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

There has been an astronomical clock on this spot since the 14th century.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.