The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Britain’s longest ancient monument, this great 8th century earthwork was built to mark the boundary between what would become England and Wales.

A 400-square foot model of historic Quebec is the playing field for a state of the art light and sound show.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

An ancient knight and a symbol of the city's freedom.

The world's most active stratovolcano is almost always erupting.

The first North American landing spot for James Cook on his third voyage of discovery in the Pacific.

A limestone wonderland of water and subterranean secrets.

In which a local geological marvel becomes a quaint roadside attraction.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

Stairs often replace streets on the steep slopes of this old mining town.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

The final resting place for the remains of 143 Habsburg royalty.

The Habsburgs' royal collections of art and wonders.

Site of the 1889 murder-suicide of crown prince Rudolf and his lover Mary Vetsera.

The world's oldest known salt mine.

A gruesome memorial for those lost in this area during the Khmer Rouge genocide.

Artifacts and memories from the Vietnam war, located in a place that experienced it first hand.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

The oldest of Venice's plague quarantine stations, designed to keep the medieval city safe from disease.

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

100 year tradition of fist fights, marked by marble footsteps.