There aren't too many operational funiculars around, but Pittsburgh has two!

A town's namesake rock has served as a spiritual matchmaker for hundreds of years.

This secluded walking trail is a hidden gem of a Pittsburgh park.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

A Belle Epoque bordello turned into a themed love hotel.

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

Stunningly detailed mosaics in a New York subway station bring life to the Weimaraners of artist William Wegman's work—and to thousands of commutes.

You must take the A train... to the last active cemetery in Manhattan.

This church looks more like a spaceship than a house of worship.

A long-closed church turned into a saintly skate park.

This overgrown Victorian chapel made of corrugated metal looks utterly out of place.

A small Byzantine church lost in the middle of the mountains of southern Italy.

This little medieval church hidden in the center of Yerevan was lost and rediscovered—twice.

A Buddhist shrine in a cave protected by macaques next to dark passages lined with creepy paintings.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Visitors to this museum will find architectural oddities, an art gallery, and an unlikely bird sanctuary.

The smallest useable chapel in Michigan is five-by-eight feet and has seating for three.

This repurposed church offers a more literal way to get closer to the heavens.

This 15th-century Serbian Orthodox monastery also contained a school for illuminating manuscripts.

The largest underground church in Europe.

Seventeen oak trees sprout from the roof and walls of this tiny chapel without any visual evidence of roots.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.