This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

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

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

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

An exquisite collection of fairytale conveyances that puts most car museums to shame.

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

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

This weeping, 10-foot-tall sculpture was a maquette for a 9/11 memorial.

WWII-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers. .

The historic home still shows the scars from a little run-in with the British in 1813.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

This improbable contraption was passed down through five generations of industrious Tennesseans.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

A secret greenspace hides atop a Capitol parking garage.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

A line of blue paint marks the route of the inaugural parade.