Places AlexOnAdventure Wants to Go

This abandoned, turn-of-the-century astronomy hub is now the subject of more photographs than it ever took.

An ornate tower shows off a local artist's architectural flair.

This mountaintop observatory is home to one of the world's largest reflective telescopes.

A modernist church in an ancient village.

A huge cathedral single-handedly constructed by one eccentric monk.

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

This century-old ruined temple was reborn as "The Church of Skate."

Famed architect Antoni Gaudi built this generous thank you gift to a friendly host who housed him during a job.

This ancient Spanish castle sits high upon a hilltop.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

Abandoned waterpark turned counter-culture mecca.

Rare karst landscape eroded from a flat seabed.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

Mine shafts and hard pastries await visitors at this massive mountain of salt.

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

A Romanesque tower appears when water levels drop.

Cursed swimming pool left abandoned is now a favorite of filmmakers and ghost hunters.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Abandoned Nazi train station turned underground astroparticle laboratory.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

Village situated on a narrow volcanic escarpment.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.