A luxury hotel housed in a former 15th century Gothic church.

Incredible labyrinth of man made caves.

At this barrel organ museum, history and live concert keep Dutch street organ culture alive.

This institution has been serving up some of the best pancakes in the Netherlands for over a century.

This public library and its impressive collection of academic books have not changed since the 17th century.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

This small chapel is built of human bones and decorated with a golden skeleton.

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.

Climb a set of vertiginous stone steps to the top of this impressive ancient edifice.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Ancient serpentine sacrifice holder that has stood the test of time.

A lush indoor jungle fills this bustling Madrid transportation hub.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

A lover's walk between hilltop towns, decorated with graffiti love notes.

The middle finger of modernity.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Bronzes and busts that once stood in the city's main squares are now relegated to a small hidden courtyard.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.