A heartwarming message to those entering and departing Music City from above.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

A giant open-air sculpture made of over 200 full-sized boats.

Paleoamericans built these ancient walls high in the Colorado Rockies as part of an extensive hunting system.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

"Mock all and sundry things, but leave the saints alone."

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

An enormous, inside-out glass globe built in 1935.

A seven-story 1920s mausoleum outside Denver houses thousands of remains.

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

The final resting place for the remains of 143 Habsburg royalty.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

This series of underground chambers contains Europe's largest subterranean lake that is slowly drained each day.

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

The clock that sets them all.

Ancient snack bar of the Roman Empire re-opened.

Pompeii's less famous neighbor is still revealing her secrets.

Large Hadron Collider and the Birthplace of World Wide Web.