Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

Elaborate tile work in this railway station tells the story of Portugal.

One man's remarkable private collection of art from around the world.

One of the smallest bookstores on the planet.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

The world's oldest bookshop still in operation.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

This kitschy tavern is also home to rare early editions of "Treasure Island."

"X" marks the spot of an echo chamber in the middle of a plaza.

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

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Cadillac where country's first big star was found dead.

The largest wooden building in the world now houses a fascinating collection of aircraft.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

A six-ton wedding present for the King of the Scots.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.