Deep scars on the earth left by the Ice Age.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

A neutrino detector built into the largest man-made underground cavity in the world.

One of the largest underground systems runs under Canada's largest urban center.

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

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

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

A well-preserved network of cavernous tunnels have spent silent centuries removing Toronto's waste.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

A snapshot of the city's fascinating voodoo culture.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

From a distance, Latin America's first Baha'i Temple looks like an enormous egg perched atop a hill.

A huge, bustling local market in Panama City.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

This 12-foot-tall T-rex is the largest K’Nex skeleton sculpture in the world.

The "worst battleship ever built" is enjoying a grand second act, submerged 30 feet in the Gulf of Mexico.

Instead of becoming a power plant, this abandoned complex became a massive letdown.

An eerie and beautiful group of columns mark the site of a grand mansion lost to time and fire.

It may take some time to locate, but it's sure to warm even a heart of stone.

Home to drunken tower-climbing goats... seriously.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.