A Spanish town built into the cliffs.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

A sign marks where the two bodies of water meet.

Along the most northwestern point in Africa is an ancient cave surrounded by legends.

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

This natural wonder is disappearing at an alarming rate.

Few other hotels can rival the grandeur of the Castle in the Rockies.

The oldest natural history museum in western Canada houses more than 5,000 vintage botanical and zoological specimens.

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

Since its original beginnings as a weather observatory mountaintop, this facility played an instrumental role in gathering atmospheric data for almost 100 years.

The natural hot spring that was integral to the creation of Canada's first national park.

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

Fossils, railroads, and waterfalls!

Spectacular views await visitors to this lake.

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

These five houses were built for the 1933 Chicago World’s Fair.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

The world's longest known cave system.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

Zipline through the deepest canyon in the eastern United States.

One street divides a single town that stands in two U.S. states.