What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

A historic lighthouse steeped in rumors of ghost and pirate stories.

During the summer, surfers in Alaska take advantage of this inlet’s unusual water patterns.

The ruins of a town wiped out by the second-largest earthquake in recorded history.

Commercial airplanes land mere feet over the heads of sunbathing beachgoers on this tiny island.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

Children's literature inside, forest all around.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Old Danish castle immortalized in Shakespeare's Hamlet.

Swedish skyscraper with a 90° twist.

Shipwrecks, ruins, and turtles are all that remain on this haunting Caribbean ghost island.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

The first, and perhaps only, monument dedicated to Wikipedia.

Colorful Native American paintings are hidden within this small cavern.

Rare signs of the former Soviet Union in the Caribbean, though not where you'd expect them.

This ancient city—home to nine civilizations—is soon to be buried under 200 feet of water.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

Huge herds of Asian elephants can be seen walking, bathing, and just chilling at this Sri Lankan park.

This fort dates back to 1588 and was colonized by the Portuguese, Dutch, and English and sits prominently on the Indian Ocean where azure water lap the coast.

Known as one of the most famous parks in Honduras.

One of Mexico's least-visited archaeological sites is tucked away inside a theme park.

His music once banned in Communist Cuba, John Lennon is now immortalized in bronze by Castro, who considers Lennon a "fellow dreamer."