A sprawling cave network created by a lone lava tube.

The longest continuous lava tube in Oregon.

The world's last remaining store of its kind.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

You don't have to be an ambassador to dine like one.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

A Gothic-style abode built to accommodate the church's three resident peacocks.

These small stands sell Malian snacks to worshippers and passersby after Friday prayers in Harlem.

More than 250 sakes are available in an izakaya hidden in the basement of a Midtown office building.

Amid skyscrapers and traffic exists this unique aquatic ecosystem.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

A museum in the building where Nazi Germany signed its surrender tells the story of World War II from the Soviet perspective.

A monument to the man who almost killed Hitler.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Lemon Grove, California is known for its giant lemon...and mummified bodies.

The freeway that never was.

The tiniest tiki room in San Diego.

Every weekend, people gather here for a brief chance to see their loved ones on the other side of the United States–Mexico border.