Secret Swing.

Only six people can sit inside this delightfully quaint sanctuary.

It may be a "Smoke Free Ontario" today, but at this museum you can still get a whiff of yesterday’s Golden Age of tobacco farming.

Over 60 chemical plants and oil refineries sit in a 15-mile-wide section outside town.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

An arresting temple full of mosaics as colorful as the politician they memorialize.

A mysterious lake provides fresh water without any source, somehow restoring itself from atop its mountaintop perch.

A long-abandoned provincial prison left to crumble in the frigid air of Ontario.

It's 2 billion years old!

Canada's oldest railway tunnel is illuminated in a rainbow of color as it passes under the streets of this small city.

A memorial to the tens of thousands of Irish who fled to North America during the Great Famine.

One of Mother Nature’s geological gems, home to many prehistoric fossils.

The antique hotel still has a jail in the basement, though the cockfighting ring is long gone.

Charleston's historic city jail once held everyone from pirates to Civil War POWs.

This inexpensive lodging house was once a prison notorious for its inhumane practices.

A 200-year-old prison that now houses a peculiar crime museum.

A Wild West jailhouse that slid down the mountainside.

The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.

The first spinning jail built in the United States is the only one that still turns.

The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

A remote hilltop covered in giant monoliths haunts the Brittany countryside.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

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