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

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

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.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

This giant boulder is pinched over a 1000-meter abyss by two mountains.

Monuments don't get much more metal than these three giant viking swords planted in a Nordic hill.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A tiny church on a man-made island in the Adriatic.

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

This lurid German fountain plots the sad course of marriage from dating to death.

Paris' linguistic guide to the international language of, yes, love.

Dozens of musicians have planted trees in this Danish park, and donated songs to go with them.

Tiring of digging out the door to this church for every service, it was eventually abandoned to the sands.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

Old Danish castle immortalized in Shakespeare's Hamlet.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Copenhagen's celebrated theme park and gardens.

A surreal statue honoring Prague's favorite literary son.

Steadily reminding Czechia of its past.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.