A whimsical village of unique treehouses resides in a Washington forest.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

A working ranch doubles as a sustainable hub for world-renowned classical music and large-scale sculptures.

A little-visited ghost town state park offers a glimpse into Montana’s "Silver Queen."

This off-the-beaten-path abandoned town is a relic of Montana's silver mining boom.

This amazingly preserved Gold Rush town is a historian's dream.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

This Costa Rican topiary park is a surreal garden of unearthly delights.

Sloth rehabilitation center in the jungle of Costa Rica.

This unusual elevator doesn’t stop or slow down.

The largest flower auction house in the world.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

Colorful and chaotic stacked hotel in North Holland.

A beautiful maze marks where three countries meet.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.