The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

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

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

A floating cat sanctuary on an Amsterdam canal.

This otherworldly church spire reaches up toward the heavens.

A museum celebrating the Victorian obsession with hair art.

Most-visited and most-photographed slot canyon in the American Southwest.

A sharp bend in a dramatic river canyon cut through red rocks.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

A geological mystery on Camelback Mountain.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

The world's largest rose bush has literally outgrown the pioneer museum it was planted behind.

Limestone caves with spectacular showcase chambers.

The world's largest military aircraft cemetery.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

America's only nuclear missile silo open to the public.

Budapest's Communist-era statues, banished to the suburbs.