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

One of the most accessible undersea plane wrecks in the world.

An unphotographable nightly march of tens of thousands of "fairy penguins" from sea to shore.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

The mummified relic of St. Antoninus.

The oldest operating pharmacy in the world features 800-year-old recipes.

Turning night into day in Victorian-era Austin to thwart a serial killer.

A store full of vintage and indie toys designed to bring out the kid in even the crustiest of adults.

A popular swimming hole that hides one of America's most deadly diving spots.

One part antique store, one part curiosities hodge-podge.

An emerald-green grotto just a short trip from Austin.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

The cell which saved the life of Ludger Sylbaris, "the man who lived through Doomsday."

These "anatomical machines" are only one of the many strange items in this Italian crypt.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A massive underwater sinkhole made famous by Jacques Cousteau.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

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

The footprint of a frustrated devil in Munich's Cathedral.

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

The patron saint of spinsters grasps a container of dried blood.