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

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

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

The world's largest wooden structure.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

A historic observatory precariously perched at the "Top of Europe."

Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.

Stunning Roman aqueduct used for 1900 years and still standing.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

Of course Salvador Dalí lived in a castle...

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This cemetery features modernist statues as strange as its name.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

Avant garde house of Pierre Cardin on the Cote d’Azur.

The fairy tale castle of the "fairy-tale king."

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.