The remains of this 2nd-century Roman temple are incorporated into a modern building.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This curious, round temple is the oldest still-standing marble building in Rome.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

The place where Samuel "Slater the Traitor" brought the Industrial Revolution to America.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

The oldest platform carousel built in the United States continues to delight children in Martha’s Vineyard.

The filming location of a shark attack in Steven Spielberg's famous shark movie.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

A unique music museum housed in a historic Boston theater.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

The "lovely red Vega" of the legendary record-settling pilot.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

The island home of an unlucky whaling captain whose story inspired a great American novel.

All that remains of the once-booming chain is a single orange-roofed restaurant.

This throwback amusement park is home to rides and unique storybook figures from the past.

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

Once the largest public hospital for the mentally ill was also surrounded by controversy.

This beloved roadside attraction welcomes visitors with his signature neon smile.

The medieval woodcut-style artwork chronicles life in medieval London.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

Only hotel where you can legally launder money.