A unique seaside cave where Aleister Crowley faked his own death.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

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

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

This small museum tucked within a subway station holds pieces from Madrid's past.

Building owners can take out tiles for free at this repository for historic building materials.

A small but charming botanical garden that contains many exotic plant species.

A hidden three-foot-wide house separates these two regal churches.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

The best place in the world to buy tinned fish.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

One of the smallest bookstores on the planet.

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

This charming candle shop has been in business since 1789.

The world's oldest bookshop still in operation.

These three pillboxes still remain as a witness of the Spanish Civil War in a park of Madrid.

These ancient artifacts are a testament to the enduring significance of the bull in Spanish culture.

This enigmatic artifact is a rare depiction of an ancient Iberian noblewoman.

A reproduction of the famous prehistoric cave paintings is hidden underground at the National Archaeological Museum.

Inside this church are the alleged remains of the patron saint of lovers, epileptics, and beekeepers.

Madrid's last horchata kiosk is a blue-and-white beacon of refreshment.

An iconic and controversial ancient Iberian funerary urn with a hauntingly penetrating gaze.