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

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

A tunnel with windows, so you don't miss out on the impressive views.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A downtown park built on top of unclaimed graves.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This memorial includes fragments from one of the greatest tragedies in United States history.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

This Route 66 classic sports a giant fiberglass rabbit that you can ride.

A motel dedicated to Southwestern nostalgia.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

An homage to everyone's favorite prehistoric cartoon family.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Iconic Los Angeles residence famous for its 19 statues of Michelangelo's David.

The exterior of this home was used for the hit television show, The Brady Bunch.

The San Andreas Fault spectacularly offsets this creek.