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

A huge enchanting public park just outside the ancient walls of Rome.

Ancient ruins hidden underneath a modern luxury hotel.

This large, circular tomb is the final resting place of the first emperor of Rome.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

A forgotten "city of water" underneath the famous Trevi district.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

A fairy tale castle in modern Rome.

Architectureal fantasy quarter of Rome.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

This subterranean shrine beneath a bike rental store celebrates the iconic Italian scooter.

Harder layers in colorful sandstone weather out as prominent “fins" and even more intricate and bizarre shapes.

This site is believed to be connected to the oldest house in Arlington County.

The final resting place of the author who gave us the Little Mermaid, the Ugly Duckling, and many more beloved fairy tales.

This North African stone complex is considered to be the oldest astronomical observatory on Earth.

These light, hollow rolls have been linked to Acadia National Park since the 1890s.

The whole of Maine's history with the salty little fish is packed into this tiny coastal museum.

An elderly widow still operates the incredibly detailed model railroad she and her husband built by hand.

The only land territory disputed between the U.S. and Canada.

A quarter mile off the coastal tip of Maine you'll find the "Beloved Island" of Franklin Delano Roosevelt.