Rare recess caves fill this unbelievably beautiful Ohio park.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

Museum preserving torture methods from the past.

This vast collection of smoking pipes from across the world spans centuries.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This cheese shop also houses a museum devoted to Dutch dairy.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

Take a drunken tour inside the world's largest known geode.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

This alley-cum-fan gallery in the ex-Nirvana drummer's hometown holds the world's largest drumsticks.

Ghost stories surrounded this “castle,” the only structure from a huge mansion that was never built.

Georges Seurat’s pointillist masterpiece has been recreated in Ohio in topiary form.