An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

Only six people can sit inside this delightfully quaint sanctuary.

This historic fort spans more the 300 years.

A forsaken wonder in the middle of the East Side neighborhood.

A natural gas leak provides a flickering flame beneath a waterfall.

One patriotic farmer's ode to the 9/11 tragedy remains even after the farm changed hands.

Curtiss is a forgotten figure in the early history of flight.

An interesting look into 18th-century American history.

An upstate New York garage advertises its services by literally putting the automobile above all else.

A distillery built on (and above!) mobster Dutch Schultz's Prohibition-era underground moonshine business.

At this farm in upstate New York, the former president plotted his reelection campaign.

This tremendous timepiece was once the largest cuckoo clock in the world.

The final resting place of the famed German pilot, the "Red Baron."

The many—66 to be exact—faces of the German forest.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The world's newest astronomical clock is also its most accurate.

Brought to you by the makers of fiberglass dinosaurs.

People in Poland have rallied to save this unnatural desert from being reclaimed by the forest.

Gliwice Radio Tower, likely the tallest wooden structure in the world.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

This dazzling wooden church was constructed as part of an elaborate peace project after the Thirty Years' War.

This elaborate stone bridge over the Neisse river has sat in pieces since 1945.

Naturally formed rock city in Poland.