The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

The old ceramics factory on Boa Vista shows the power drifting sand has to destroy buildings.

Semaphore saints, a golden dragon's head, and a stone carved with religious warnings all call this cathedral home.

Follow the original medieval paths that wind through this intriguing section of the city.

Rolling sand dunes of the Sahara... in the middle of the Atlantic Ocean.

This ship carrying cargo and four church bells for the Catedral Metropolitana Nossa Senhora Aparecida ran aground in 1968.

London's old-school healing garden.

Named after a lodging site that existed nearby, a bridge has existed at this location since 1455.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

Originally commissioned as a sculpture to reflect the history of Belfast's red-light district, the final sculpture has been banned from Belfast public land.

A museum dedicated to the tragedy of Bloody Sunday.

Northern Ireland's Brobdingnagian stepping stones.

This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.

A must for film lovers in Madrid and home to the Spanish Film Library's projection space.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

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

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

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

Automatons that were once removed after one fell from the building.

These distorting, funhouse mirrors achieved fame in a renowned piece of Spanish theater.