Erotic art covers the walls of the largest ancient pleasure palace.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

This large, circular tomb is the final resting place of the first emperor of Rome.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

Two thousand artifacts from around the world collected by one woman who loved to travel.

One of the now-less-hidden floral gems of the "Emerald Necklace."

This fantastical waterfall is hidden in a cave located in a cracked cliff.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Three columns of volcanic rock shoot out of the ocean.

From bench to vandalism to art, this silly prank seat was funny enough to become permanent.

Elevated freight railway turned wildly successful urban park.

This small shop walked so America could run on Dunkin'.

From economic backbone of a community to deadly diving hole, these former stone quarries are now a park for rock climbers and graffiti artists.

The ruins of one of the first railroads in the U.S. lie hidden within a neighborhood cul-de-sac.

This urban drawbridge gained eternal pop culture fame when the Blues Brothers jumped it while it was raised.

One of Chicago's last seafood smokehouses perfects a dying breed of fishcraft.

A display of magnificent stained glass windows is the first exhibit of its kind.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

This historic hotel invented the chocolate brownie.