The sign marks one of the endpoints to mainland Britain's longest overland travel route.

This Scottish bay still reveals evidence of its days as a seaside swimming pool.

A short hike into the mountainside forest reveals a decaying 1890s town.

Despite repeated attempts to make it work, this former mining town is now nothing but dust and memories.

The remnants of an early American attempt at missile defense.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

Odd outsider art installations surround a Gold Rush-era ghost town.

This amazingly preserved Gold Rush town is a historian's dream.

A life-size replica of a Spitfire that sits in a quaint suburb.

In Tulsa's Oil Capital historic district, even the bus station is "fauxback" Art Deco.

A beautiful lighthouse with as many steps as days in the year, as many windows as weeks, and as many levels as months.

Located in the house where Gustave Flaubert was born, this odd museum has more to do with medical grotesquery than the Western novel.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

A Cold War command center is hidden under an idyllic countryside.

A rare example of World War I trenches from the British front.

A moving memorial to the fallen and missing from WWI trenches.

A reconstructed World War I-era communications array that was once hidden in plain sight.

These mansions date back to Chicago's days as a brewer's paradise.

Hop aboard a charming bog train to explore this rare open-air museum of peat.

The real-life site of Ichabod Crane's infamous gourd attack.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

Step aboard the first ship to circumnavigate North America.

Op-art architecture designed for happiness.

The gnarled remains of an exploded German bunker from World War II sit along a breathtaking fjord.