In 1912, this idyllic Alaska landscape was blown apart in the largest volcanic eruption of the 20th century.

Famous for its bio-luminescent inhabitants, known as "dismalites."

Cambridge’s century-old outdoor swimming pool is tied for being the longest pool in the United Kingdom, but it is also unusually narrow.

Soak up some local history in this restored Edwardian era swimming pool.

One of the deepest indoor swimming pools in the world.

A 1930s Art Deco swimming pool with a design inspired by grand ocean liners.

This scenic waterfront swimming pool is the longest salt water pool in North America.

This ultra-modern wooden boardwalk turns the ocean into a swimming pool.

A record-breaking pool that uses computers to turn ocean water into cleaner, private swimming water.

Visitors dip into a variety of pools of what was once ice.

Every summer, an open-air swimming pool appears at the base of a Finnish city's beloved winter attraction.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

In addition to fishing and camping, this spot in Nebraska’s Sandhills is one of the world’s darkest places.

After sitting abandoned for decades, this historic mine is now the only publicly accessible chalk room and pillar mine in North America.

This erect, phallic geological spire wasn't always named so domestically.

Other-worldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

Underneath downtown Lincoln resides a network of caves that was also the city's first brewery.

America's largest man-made forest was planted in an effort to bring back the past.

This astronomical clock is the second oldest in England.

One of the world's most complex timepieces.

Tiny communists hammer away on the Olomouc Astronomical Clock.

Macabre astrological automaton clock dating to the late 1400s.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

There has been an astronomical clock on this spot since the 14th century.