An ancient and majestic fortress that played an integral role in Portugal's road to independence.

Perhaps the most spectacular grotto along the Algarve coastline.

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

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

The ghost town where the villagers refuse to leave.

A relic of World War I that now exist as a piece of public art.

Also known as Uncle Karl, the beloved bronze copper keeps a watchful eye on St. Stephen’s Basilica while people rub his lucky belly.

A much-loved sculpture depicting the hero of a 1956 anti-Soviet uprising.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

Once the home of a hermetic monk, this cave now houses a small church.

This statue of a falling man commemorates a teenage martyr of the Hungarian Revolution.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This unique structure allowed boats to bypass underwater mine barriers in the channel to enter the harbor.

A musical instrument played by the sea.

An abandoned Byzantine fortress and notorious prison.

One of the most photographed locations in the entire city.

An ancient octagonal weather station named for the eight Greek gods of wind.

The only ancient site that remains on the south bank of the sacred Ilissos river.

A sharp sculpture made of thousands of pieces of jagged glass.