An 18th-century Spanish watchtower made entirely of seashell and concrete.

Intertwined, interspecies trees which locals believe can grant boons to lovers.

A tribute to Ponce de Leon's supposed quest for eternal youth.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

A monument celebrating the idea of reaching inaccessible places.

The smallest post office in the United States is no bigger than a broom closet.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

For the holidays, the tallest broadcasting tower in the Netherlands turns into one of the world's tallest Christmas trees.

The birthplace of most all of Europe's space missions is here on the Dutch coast.

An idyllic hotel that gave its name to a supposed shadow government.

Building Men of War and Indiamen from Holland's Golden Age.

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

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

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

Go inside a revolutionary, cage-less zoo where 70 species of monkeys roam free alongside their human visitors.

Remarkably preserved body discovered in a peat bog.

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

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

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

A miniature city, once ruled by the Queen of the Netherlands.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

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

A beautifully eclectic mix of architectural styles.

Amsterdam's Red Light District leaves little to the imagination.