The birthplace of the builder of the Statue of Liberty is now a museum dedicated to his work.

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

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This small hilltop church weaves the urban history of Washington, D.C. with the national history of the United States.

The National Park Service’s best-kept secret with views that rival any in D.C.

Washington's iconic carousel has a nice piece of Civil Rights history.

A rococo room covered entirely in porcelain originally constructed for another royal residence.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

Where royalty waits in the height of luxury.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

The last four extravagant street signs of London's historic banking street.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

An unusual round church in London with a Templar past.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The ornate structure is part of a building boasting more marble than the Vatican.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

This 16th-century close preserves an unusual piece of Edinburgh's transportation history.

A verdant 17th-century-style garden hidden along Edinburgh’s Royal Mile.