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

Three sinkholes filled with warm, crystal-clear water reached by a horse-driven cart on an old train track through the jungle.

Traditional architecture and ancient irrigation systems are on display in this gorgeous mountain village.

This beautifully restored fortification kept the city safe for centuries.

An imposing Omani fortress surrounded by date palm trees.

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

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

An underexplored, 130-foot tropical waterfall that you will have all to yourself.

Where the White Nile River dramatically cascades between Lake Kyoga and Lake Albert in Uganda.

This small but lovely sinkhole lake is the last remnant of a great prehistoric water basin.

The pristine waters crossing this forest form a hidden waterfall among the dense vegetation.

One of the largest single-span stone-arch bridges in the Balkans looks like something straight out of a fairytale.

Local lore says two enemy dragons live within these breathtaking mountain lakes.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

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

Stroll through a wonderland of stupendous moss-covered trees.

Rustic natural hot springs in the deciduous rain forest.

Geothermal waterfalls in Tuscany.

The hellish conditions of this abandoned mine that snakes beneath the Pacific Ocean gave it its diabolic name.

One of Chile's most active volcanoes is riddled with beautiful caves.

This odd Chilean waterfall-cano hotel must be entered via a rope bridge.

This enchanting rainforest hotel looks as though it grew from the forest itself.

This Japanese-inspired labyrinth of hot springs is hidden in a Chilean forest.