This collection of ferns from across the globe is the largest assortment in the United States.

View rare birds and interact with lemurs at this nonprofit run entirely by volunteers.

The only Florida state park with publicly accessible caves.

Silent memorial, using bone conduction to take people back to the Dresden Bombing of 1945.

An abandoned swimming pool decays on the outskirts of Berlin.

The highest cold-water geyser in the world.

Largest illuminated advertisement sign in the world.

This small gallery nestled inside an old botanical glasshouse is a quiet place to enjoy art and nature.

Residing along a busy thoroughfare, this sculpture urges passersby to consider the future.

This natural "sea of stones" was once used by the Romans as a quarry.

A two-inch thick solid brass rod that extends an astounding one kilometer straight into the earth.

This giant statue of a vulva became internationally famous after an American exchange student got stuck in it.

The oldest trees in Northern Germany.

Now overgrown, these anti-tank barriers from World War II are sometimes called "dragon's teeth."

This 18th-century folly is one of Europe's rare "garden mosques."

A beautiful collection of taxidermy birds and rare pomological wax models.

These beautiful objects represent beautiful ideas.

This German "living museum" is maybe a bit too immersive.

Tourists often confuse this beautifully ornate former cigarette factory for a mosque.

A preserved college lock-up that recalls a clubhouse approach to discipline.

Giant wind turbine with observation deck at the very top.

One of the oldest cemeteries in Germany was originally used for victims of a cholera epidemic.

A top-secret bunker now turned museum, is an eerie look at what life would have looked like in the event of nuclear war.

A varied collection of brains in alcohol.