A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

A stone copper was sculpted on the wall of the Carlisle Cathedral to honor a local hero.

Entire apothecaries are on display at this Lisbon museum, which explores the history of medicine.

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

This giant sculpture made of trash is a critique of society's wastefulness.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

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

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

A unique seaside cave where Aleister Crowley faked his own death.

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

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.

The world's oldest bookshop still in operation.

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 memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

This hauntingly beautiful cemetery outside a medieval citadel is full of winding paths and ivy-covered graves.

Romania's triumphal arch looks out over Bucharest.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

Something's watching you.