Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

Dutch woodpile home in the forest.

This imposing tower named after the mythical sword of King Arthur is considered the tallest freestanding climbing wall in the world.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

The world's largest collection of ships in bottles.

The history of sea-faring refuse and disaster is on cramped display in this Netherlands folk museum.

The largest flower auction house in the world.

A 1:20 scale piece of the Netherlands commissioned by a queen lets visitors take a stroll as giants.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

The tallest waterfall in the Netherlands is a lovely, stepped feature that is only 50 feet tall.

A Dutch clog company in the town of Zaandam loves the wooden shoes so much it made a museum for them.

A collection of biblical memorabilia.

This miniature take on the Kremlin is one Dutch man's retirement project.

This unique bridge physically lifts a piece of the road into the air to let boats pass by.

A unique collection of gilded age mechanical pianos.

A UFO-shaped event building originally intended to be a science museum showcasing the future.

Survival capsules find a second life as a unique hotel.

Live out your childhood construction fantasies in this one-of-a-kind gyrating hotel.

A monument hidden in the woods built in 1938 as a getaway for a Dutch museum curator.

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

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

A grassy pyramid named after a French battle.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

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.