Deep within the mountains, a towering natural wall of tightly packed basalt columns mimics a colossal ancient fortress built by no human hands.

Carved through granite boulder fields and primeval forests, this roaring river valley once served as the secret naval training ground for the legendary Tay Son insurgency.

Perched atop an isolated 779-meter mountain peak, this enigmatic Cham ruin remains shrouded in mystery regarding its age and purpose.

Standing as a 12th-century architectural titan, this trio of brick structures boasts the tallest surviving Cham tower in Vietnam, reaching an impressive height of 38 meters.

Hidden within the mountains of Vinh Son, this geological marvel features a roaring waterfall cascading over a massive, million-year-old basalt cliff shaped like a giant upside-down stone honeycomb.

Nestled against the majestic Ba Mountain, this historic spiritual sanctuary features one of the tallest outdoor Buddha statues in Southeast Asia overlooking the ocean.

Hidden within a massive coastal lagoon, this secret mangrove forest serves as a vital sanctuary for rare and elusive water bird species.

Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

These otherworldly caverns form Earth's oldest known cave system.

An underground spring in a labyrinthine cave system, decorated with stalagmites and stalactites.

Erosion has transformed this sandstone boulder into a massive dune-filled cavern.

Idaho’s largest, deepest limestone cave is known for its quirky rock formations and bat population.

A rock maze opens up to a panoramic viewpoint at an abandoned mine full of ghost stories.

This little known mountain has claimed four times as many lives as Everest.

In a lighthouse by a vanished sea stands a museum for a man who never existed.

Home to the oldest operating roller coaster in the Southern Hemisphere.

Fossilized remains tell the story of the region’s past inside this small, unassuming museum.

Displaying religious art made almost exclusively in modern styles helps set this Buddhist temple apart from the myriad others in Bangkok.

A colossal watermelon slice celebrating Muscatine’s sweet agricultural heritage.

A small town that began as a western movie set.

A collection of over 100 statues of people who fought for the freedom of South Africa.

Get lost in the fantasy underworld of Thai serpents where wishes are granted

War-ravaged ruins of a Benedictine monastery founded in the early 12th century, later rebuilt into a fortress.