This star-shaped military outpost is now simply trying to protect itself from neglect.

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

This unreal Portuguese palace looks as though it's made from a pile of different castles.

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

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

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

Shrapnel scars and bullet holes from the Spanish Civil War can still be seen in this monument to Spanish doctor Federico Rubio.

This grand gate once marked the entrance to a military barracks.

This modernist bridge highlights the bear as a symbol of Madrid.

This 18th-century pond is one of the main attractions in the Jardín del Príncipe in Aranjuez.

An Antoni Gaudí masterpiece in Astorga.

The largest and best preserved necropolis in the Western Mediterranean.

Once a resting spot for King Fernando VII.

In this 400-year-old hotel in Madrid, you'll find a comb in every room, an old clock, and maybe a ghost.

The former home of a conniving 17th century politician is now a high-end hotel.

One of the best examples of the modernist movement in Madrid.

Meant to resemble a massive tree, the building is the best example of Spanish organicist architecture in Madrid.

The mysterious large white cross visible from the runway is a memorial to a massacre during Spanish Civil War.

The facade of this 16th-century building is decorated with carvings of 300 seashells.

This Art Nouveau gate still stands at the former entrance of a 20th-century Spanish writer's colony.

The tallest tower in Cáceres's Old Town.

A must for film lovers in Madrid and home to the Spanish Film Library's projection space.

32,000 tiny soldiers are posed in 23 historical settings.

A window into a long-lost world, these colorful tiles advertise a long-defunct range of purgative teas, harmless smokables, and diarrhea cures.