The first "Hut" was actually a small brick building.

Incredible miniature towns and buildings created and decorated with thousands of tiny rocks.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The fairy tale castle of the "fairy-tale king."

One of New Zealand’s few castles boasts beautiful gardens, grand architecture, and a history filled with family drama.

A gardener's enduring labor of love is spread throughout a small Vermont town.

This pair of eccentric Ohio castles were built by a pair of brothers who wanted to bring a bit of class to the Ohio wilderness.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

Locals use these rock pools and waterfalls for swimming and cliff diving.

Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

An abandoned mine pit is now a beautiful, colorful attraction.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

Perhaps the most spectacular grotto along the Algarve coastline.

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

The land is home to swimming ponies and a legendary 18th-century treasure.

An abandoned swimming pool decays on the outskirts of Berlin.

A popular swimming hole that hides one of America's most deadly diving spots.

Floating swimming pool within a moored vessel.

Nature's biggest mammal swims in landlocked Oklahoma.

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

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Described as "the world's most blinging pool."