Oldest Museum of the Netherlands is a true cabinet of curiosities.

The 20-mile causeway that separates the Netherlands from the sea.

The place where Czar Peter I of Russia resided in 1697 during his Grand Embassy.

Colorful and chaotic stacked hotel in North Holland.

Last residence of H.P. Lovecraft featured in his story "The Haunter of the Dark."

A notorious punk house turned co-op.

A bit of retro transportation flair preserved in the world's largest department store.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

A quiet and contemplative oasis in the middle of New York's bustle and riot.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

Elevated freight railway turned wildly successful urban park.

A crumbling hospital from the 1850s on Roosevelt Island.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

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

A remarkable two-country morph, this town is part of Germany legally but is by all other measures Swiss.

The great Danube river starts here.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

Stuffed people arranged in unsettling scenes give a voyeuristic glimpse of life within a historic old hotel.

A German town is growing a building out of trees.

This famous city eluded concrete detection until the early 2000's.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances.

This ancient abandoned church in a remote part of Turkey is in danger of falling over.