Ruins of a 10th century church tucked away deep in a botanical garden.

This Italian church is as beautiful as it is common, except for the real skulls decorating the many mannequins inside.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Final resting place of one of the classic authors of horror literature.

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

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

Underground monastery and fortress.

Medicinal spa created with the discharge from a geothermal energy plant.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

Come for the flowers, stay for the bats!

This historical theme park celebrates all things noodle.

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

A fantastical group of cliffside stairways, bridges, and twisting paths carved out of stone provide a surreal coastal hike.

Christ's blood preserved in a Belgian town.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

Mount Nyiragongo has erupted at least 34 times since 1882 and is home to the world's largest lava lake.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

The world's smallest movie theater runs on solar power—an attraction in itself.

The sign at the garden gate reads: "These Plants Can Kill."

This peculiar lake of pitch is so thick and viscous that one can walk on its surface.