A botanically themed auditorium blooms within the world’s last operating double-decker theater.

This massive, ancient stone was disassembled and then put back together again.

One of the foremost Sherlock Holmes collections is hidden away at a Toronto library.

This Toronto garden collects stares and tchotchkes in equal measure.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

A Canadian POW for German soldiers during WWII where prisoners hatched an elaborate escape plan.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

It houses the remains of a 17th-century version of the Titanic.

This heart-shaped island looks substantially less lovely after a recent bulldozing project.

This Croatian island is for sale but no one is buying due to the dozens of accused Nazi sympathizers who were massacred there after WWII.

The remains of a sunken military ship wreck visible through clear water.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

A musical instrument played by the sea.

Ancient serpentine sacrifice holder that has stood the test of time.

1513 Turkish world map, full of European state secrets and snarky commentary.

Turkish adventurer antiques in the heart of the Grand Bazaar.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

A museum filled with tiny, adorable versions of the mighty Royal Danish Navy.

This modernist tower was saved by a fraternity with a 500-year-old penchant for shooting at wooden parrots.

A symbol for the opposition to nuclear power around the world.

An exhibition of preserved locomotives housed in a 1950s depot shows the history of Denmark's railway.

These old World War II fortifications have been transformed into an unusual equine attraction.