An unassuming secret door once led to a legendary watering hole.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

A dead saint, a deadly poison, and a mysterious holy ooze.

For the last eight decades, this curious shop has been ridding Atlanta of bad juju.

A psychedelic tribute to one of Georgia's most unique artistic visionaries, out of place and time in the heart of Atlanta.

This vintage gem is one of the oldest surviving purpose-built movie palaces in Scotland.

Guitarist Paco de Lucía overlooks travelers as they pass through this train station dedicated to his legacy.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

Built to power trains, the engines in this building provided the entire city of Madrid with electricity during the Spanish Civil War.

Shrapnel, dynamite, bullets and Franco couldn't destroy this bust, rescued and kept hidden as a family secret for over 40 years.

This Roman monument is surrounded by more recent construction, offering a stark contrast between ancient architecture and the modern urban landscape.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

A bronze plaque marks the site of the only show the "King of the Soul Singers" ever missed.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

This massive complex is made up of hundreds of smaller temples that date back to the ninth century.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Rainbow-hued in the summer and crystalline in the winter, this salty lake has inspired battles, temples, and plenty of awe.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.