There's a labyrinth of manmade tunnels stretching for over an acre beneath Bristol.

Commemoration of a sea voyage gone mysteriously wrong.

A boardwalk winds above this beautiful bog full of wildlife and a rare type of turtle.

This tiny square mile of Canadian sand was once considered the world's smallest desert.

The world's longest covered bridge is a quaint and incredible wooden tunnel.

The Arctic Archipelago is home to world's largest third order island: an island in a lake on an island in a lake on an island.

The third version of this tall sailing ship sits, rusted and burnt, in Lake Ontario.

Roadside collection of 65,000 signs.

An abandoned town centered around a paper mill powered by a large waterfall.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

This Canadian island is a veritable garden of decay with countless abandoned structures dotting the landscape.

The wreckage still sits at the exact spot the plane crash-landed in 1945, carrying 1,000 pounds of explosives.

This three-chambered cave is the only protected natural bat hibernaculum in Quebec.

Hunt for buried treasure in Nova Scotia.

A school teacher's massive and terrifying self-built castle.

A lake in the middle of the tundra of Quebec is said to be the purest freshwater lake on Earth.

The remains of a paranoid inventor's hidden workshop lie in beautiful ruins amidst a Canadian park.

What was to be the world's most secure Cold War document vault ended up as just a few shallow caves.

The ruins of the "20-year town" lay out among the mountains of Alberta.

While these wooden totems bear a striking resemblance to First Nations artwork of British Columbia, their actual origins lay on the opposite side of the Pacific Ocean.

Legend says that this short Canadian tunnel still holds the dying screams of a girl who burned alive.

An abandoned Victorian-era amusement park is rusting away amidst luxury houses.

Fossils, railroads, and waterfalls!

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.