Peek into a cave of giant, glimmering crystals.

Geological storytelling.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

An exact replica of a colossal Olmec head sits atop a pyramid within a Madrid traffic circle.

This lucky bronze frog was gifted to Madrid by a casino.

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

Cliffside houses provide a spectacular view from their perch above the valley.

A charming Spanish village sits atop this natural limestone overpass.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

A Spanish forest is filled with mysterious stone carvings.

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

The morbid items in this small and hidden museum are not for the weak stomached.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

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

Mountain where Jesus was first tempted by the Devil.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

This cemetery features modernist statues as strange as its name.