The prototype for all Nazi concentration camps.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Jesus' footprints and the first catacombs in the world.

Ancient serpentine sacrifice holder that has stood the test of time.

A marvel of Byzantine engineering under the streets of Istanbul.

1513 Turkish world map, full of European state secrets and snarky commentary.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

What better place to take a seat?

An engraved boulder marks the spot where Patsy Cline's life ended in a plane crash.

A bizarre roadside attraction and the first instance of miniature golf in the world.

Famous for its bio-luminescent inhabitants, known as "Dismalites" .

More than five miles of underground passageways.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

This replica of the Greek structure is in the heart of Nashville.

One person's lost luggage is another person's treasure.

This simple, broken column marks the final resting place of one of America's most famous explorers.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

A cemetery for only coon hounds in northwest Alabama.

This historic oak tree has been around for over 300 years and might last for 300 more so long as it doesn't fall apart first.

The short-lived history of a new republic and British control in West Florida.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

Brussels' favorite peeing boy has a sister.

A little sculpture with a large wardrobe.