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

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

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

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

The oldest Roman lighthouse still in use.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

Giant topiary dog once played a role in a terrorist bomb plot.

Some of the smallest works of art in existence.

In 1396, two Scottish clans that had been violently feuding for centuries finally faced off in a bloody battle in this park.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

Every St. Andrews student knows to avoid this inscription for fear of a martyr's curse.

This tin chapel was built by POW's during World War II and is painted to look like something much more grand.

An 18th-century lighthouse built on a 16th-century castle is now a monument to the maritime beacons of Scotland.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

Scotland's oldest medieval bridge is also among the last reminders of early medieval Aberdeen.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

The Guinness Record holder for largest hedge in the world is a verdant Scottish bulwark.

A nuclear bunker built to shelter the politicians and important people of Scotland in case of nuclear attack.

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

This bronze statue was erected to honor a small Scottish town's beloved stray cat.

An optical Illusion once believed to be an electrical phenomenon.

A glacial pothole was once a hideout for a notorious Scottish outlaw.

This Scottish museum is the only one in the world to focus not on one religion but all of them.

This Scottish manor house is a lush relic from the life of a literary great.