The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

Spain's largest bullring offers a unique glimpse at architecture and history.

It houses the remains of a 17th-century version of the Titanic.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

A 18th century graveyard and its astonishing cortege of macabre iconography.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

This elaborate towering structure was once famed for its revolutionary height.

The oldest surviving botanic garden in the United States.

A layered tribute to the work of mosaicist Isaiah Zagar.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The world’s first penitentiary, meant to be humane, drove men insane.

Visitors to this library are in for a real-world education in modernist architecture.

This geothermal hot spring hides beneath a slowly growing mineral dome.

What's a diner from the 1939 World's Fair doing in a remote Utah mountain town?