Exotic feline breeding compound and conservation center.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Towering basalt columns, a creation of fire and ice.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

This Southern Californian Conservation Center is home to singing and howling apes.

The ruins of the castle that chemicals built.

Acres of natural wonders left behind by a socialite-turned-gardener.

Over one million bird-related artifacts await.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

Built in 1911, the Tees Transporter Bridge is one of only six transporter bridges still in operation.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Built during the Scottish boom in the oil industry, the village was never inhabited.

These fantastically named natural pools look like something out of a Scottish myth.

This Scottish bridge seems to compel dogs to leap to their death.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

The mystery of this small, brick pond eluded its possibly only investigator until his death.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

England's most notorious suicide spot.

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

This ghost town in Belgium will lose its street art when it ceases to exist.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.