Once used to calculate the various levels around the country.

Crumbling World War II-era gun emplacements still stand near lighthouses on the Spanish coast.

A small house in Tazones, completely covered in shells.

A wonderful collection of fossilized dinosaurs and other creatures that roamed the landscape millions of years ago.

A magnificent place to see authentic paleolithic cave paintings that are an astounding 33,000 years old.

A spectacular walk on the flank of a gorge.

These ungulates have quite literally bounced back from the brink of extinction.

A small church ornamented with medieval erotic sculptures.

This centuries-old tower hosts endangered bald ibis mating pairs and looms over a pristine beach.

An otherworldly art experience.

The history of drinking is told through 1,800 cups, chalices, and glasses at this exhibit.

Before this rocky hill was home to a chapel, it was used as a lookout by Romans and Moors.

A museum dedicated to one of Portugal's most celebrated writers.

This museum documents the ancient practice of salt production in Figueira da Foz.

A devasting 2020 fire left this historic seminary in ruins.

A deer-headed statue that brings together a 12th-century legend and big wave surfing.

The crumbling ruins of an abandoned 12th-century monastery.

Entire apothecaries are on display at this Lisbon museum, which explores the history of medicine.

The camera-toting gargoyle juts out from the exterior of a Gothic cathedral.

This Gallo-Roman sanctuary is dedicated to Serápis, god of the underworld.

This remote location of this Moorish stronghold means it doesn’t attract many tourists—and that it still has the aura of fear and bravery of the 1300s.

The history of this Moorish castle includes royals, a Mexican-Spanish association, and several attempts at lodging.

The ruins of a 2,000-year-old Roman fishing village perched on one of the best beaches in Spain.

An abandoned mining complex in Serra do Gerês.