The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

Single runway interrupted by a busy road that cuts across its middle.

The feminist fashion collective centering Palestinian craftsmanship and radical transparency.

These spartan apartments are provided to clergymen visiting Vatican City.

A wellspring of natural Viagra found in Bosnia.

This deconsecrated church has seen many uses, from a tobacco storehouse to a cinema.

One of few vertical lava tubes in the world accessible by foot.

This post-war motel embodies a little-known, Miami-born architectural style.

A man throwing a giant severed hand towers over Antwerp’s main square.

The former headquarters of history's oldest megacorporation.

The world's first ice hotel is still one of the most elaborate and beautiful.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

Perhaps the most spectacular grotto along the Algarve coastline.

A museum of tiny buildings in the tiny country of Andorra.

Also known as "Leicester's Folly," this almost cathedral was left unfinished and in ruins.

These lovely Turkish-styled baths were brought back to life after winning a reality show competition.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

The world's longest and deepest train tunnel.

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The world's oldest grape-producing vine has survived four centuries of turmoil and even has its own anthem.

The only quarter of the Old City not dedicated to a major world religion.