Rumors of the occult haunt this upscale 1920s hotel.

Home of the physician who set the leg of John Wilkes Booth after the Lincoln assassination.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

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

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

The world's longest known cave system.

The celebrated eyesore created by starry-eyed sweethearts.

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

France's most famous cemetery, with some of its most curious tombs.

This grubby wall is said to be one of the Earth's esoteric energy centers.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.