This historic hotel invented the chocolate brownie.

Years of archaeology, just chillin' by the water cooler.

These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.

Go inside to really appreciate this 500-year-old technological masterpiece.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

The largest stone moai on Rapa Nui.

One of Ireland's most infamous prisons for rebels including men, women and children.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

A multi-storied adobe complex has been inhabited for more than a thousand years.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

The unbelievably opulent home built for an infamous newspaperman.

Copenhagen's celebrated theme park and gardens.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The highest bridge in America was built for an almost unnervingly small amount of money.

When ecosystems collide in the arid Southwest.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The subtle science of a master molecular gastronomist.

Legends surround this jagged rock formation in the New Mexico desert.