The summer tourists on these cliffs are thousands of seabirds.

The most powerful waterfall in all of Europe.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

A memorial museum to the political prisoners who were held at Sighet Prison, once one of the most feared places in Romania.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

Known as one of the most climbed mountains in the world, this barren peak is permanently bald thanks to an anti-wolf fire.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

This canyon is comprised of gorgeous waters and magnificent basalt columns.

This beautiful, historic church looks like something out of a simpler past.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

Every summer local children form "pysja patrols" to save young birds that have wandered from their nests.

A little-visited waterfall in an otherworldly landscape.

A 200-year-old tavern challenges guests to finish a glass of wine while hanging from a ceiling beam.

Museum dedicated to wax representations of disfiguring diseases.

Caves famous for the dragon-slaying saint who lived there.

Walk through a restaurant's refrigerator door to reach this hidden bar.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

Though they've since been renamed, these two streets hint at Dublin's darker days.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.