An ancient and majestic fortress that played an integral role in Portugal's road to independence.

The room where Vincent van Gogh died.

A grandiose octagonal home crowned by a large dome stands out among the antebellum mansions.

A rare example of the RAF’s flying spy taxi.

A natural wonder in south Denmark.

Alexander Milliner, a favorite of General Washington, is interred at Mt. Hope Cemetery along with 80 other Revolutionary War veterans.

A uniquely authentic display of traditional Russian culture.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

The only international border marker within the United States.

These mechanical goats first battled it out in the year 1551, all because of an overcooked deer.

The world's largest woodcarving collection includes dozens of Bible scenes and a wooden bestiary, all carved by one man.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

A preserved block of timber buildings from the city's industrial era in the Middle Ages.

This seaside production studio was built to film 'Titanic' and has been the wet set of choice for other Hollywood productions since.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

One of the most powerful religious centers in the Middle Ages, dubbed the founder of Western monasticism.

In this coastal town, the time-honored tradition of reenacting the struggle between the Christians and Moors includes the arrival of the Moorish fleet.

The ruins of an abandoned cemetery are among the last remnants of the old village of La Boulaye before a wealthy landowner had it relocated.

The site of one of the largest non-nuclear explosions in history, created when a massive bomb dump accidentally exploded.

A tiny island home to a former English slave fort.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

Why is there a vintage Rolls Royce in this Buddhist temple?