An engineering wonder at Pillnitz Castle protects a precious 230-year-old flowering shrub.

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

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

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The oldest public library in Ireland.

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A pair of gigantic baby heads greet passengers at Atocha Station.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

Commonly acknowledged as the only public monument to the Devil himself.

A lush indoor jungle fills this bustling Madrid transportation hub.

An ancient Egyptian temple in the middle of Madrid, Spain.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

A small museum displays some of the artifacts discovered during a subway station renovation.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

St George's Leprosy Museum depicts the gruesome afflictions of those suffering from the disease.

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

The statue of a legendary giant who carried Christ and shouldered the world's sins.

This enigmatic artifact remained buried in a churchyard for years.

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

Medical museum that houses most notably the taxidermied remains of Vladimir Demikhov's famous two-headed dog experiment.