Narrowest house in Boston.

This landmark cemetery in Boston was created more than 300 years ago.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

A mysterious stone embedded at the base of a historic Boston building.

Craggy concrete faces are hidden in the walls of this artificial cave along the San Antonio River.

For over 75 years, this cute stone statue has warmed the hearts of San Antonio.

Austin’s local mountain isn’t really a mountain at all.

A fantastic place to see murals, and an important location in the history of Toronto's legal street art scene.

This whimsical fountain pays tribute to Toronto's four-legged friends.

One of the largest underground systems runs under Canada's largest urban center.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This half-ton piece of the Alps sits at the base of the CN Tower.

The artwork commemorates the many ways 20th-century people perished while on the clock.

The giant birds honor two native North American species.

The oldest brick house in the state of Ohio.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

This rustic old building is said to be the most photographed barn in America.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

Amazingly detailed marble cinerary urns that once held the cremains of Roman elite.

A contemporary fresco movement illustrates the region's rich history.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.