Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A volcanic cone that formed over 600 years ago.

A new monument to an old grave that was uncovered during the rebuilding of a California ghost town.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

An entire town preserved as a historic landmark.

The picturesque remains of an abandoned silver mine slope down to Tagish Lake in the Yukon.

A monument commemorating the role of Alaska's native Tlingit guides in the Klondike Gold Rush.

This "Alaska-style" billboard is over 100 years old.

A classic gold rush hotel can be expected to pick up some ghosts along the way, and the Golden North is no exception.

The facade of this relic from the Klondike gold rush is decorated with over 8,800 pieces of driftwood.

Originally a brothel during the Klondike Gold Rush, this bar once used dolls to denote when ladies were working.

A historic freight system that found the true gold rush is in tourism.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

The beginning of the historic Iditarod Trail connecting the Alaskan cities of Seward and Nome.

Dive into the history and true tall-tales of Banff National Park.

Though many were skeptical at first, these animal-specific routes across the Trans-Canada Highway have been a major conservation success.

In 1909, the steepest and most difficult piece of track on the Canadian Pacific Railway was replaced with a series of spiralling tunnels cut into the mountains.

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

An abandoned WWII-era U.S. Army megaproject, turned hiking trail in the remote Canadian subarctic.

This Alaskan town appoints the general store's resident feline as honorary mayor.

The easternmost town in Alaska can only be accessed from Canada.

Permanent exhibit reminds visitors of the Exxon Valdez.

An auroral research program that superheats the ionosphere.