The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

One of the few places where you can visit a cenote and Maya ruins at the same time.

This cavernous swimming spot doubles as a home to the largest known colony of bats in Central Asia.

A natural tidal swimming pool is ringed by bizarrely artistic lava rock formations.

These azure waters were thought to lead to the Mayan Underworld.

A clear blue swimming hole with hidden caves, still unexplored.

The world is full of swimming holes, but few compare to Samoa’s idyllic To Sua ocean trench.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

A long-forgotten Victorian swimming hole is still a fun spot for a dip.

Take a dip beneath the stalactites in this amazing cenote.

This geothermal hot spring hides beneath a slowly growing mineral dome.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

The gathering point of an old Melbourne swimming club was site of a historic, world-record dive in 1918.

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

A sinkhole and now a swimming hole, too, full of dazzling turquoise water.

This gold mine–turned–swimming hole is the perfect summer picnic spot, immersed in nature and history.

On the edge of grassland in northeastern Colorado, these rock formations are some of the few remnants of a high plain that has eroded away over millions of years.

Where the Monitor was launched and ushered in the age of the "ironclads."

“Wagon Jobber" turned smokehouse magnate's family-owned business is still going strong 100 years later.

Known as the "Forgotten City" it was home to industry, riots, artists, squatters, and to one of the largest single disaster fires in New York City.

Once a flowing stream and where the USS Monitor, the world's first ironclad, was built and launched.

The unique building practices of the Batammariba reflect the community's deep reverence for and connection to the earth.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

Nikola Tesla's former home contains an homage hidden from plain sight.