Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

The lengthy skeleton of one of the tallest Spaniards of all time is on display in Madrid.

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

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

The remains of this misplaced church were moved here stone by stone.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

Five million people are laid to rest here, more than the population of Madrid itself.

This postmodern apartment block was designed to be a vertical neighborhood.

A subterranean relic of the Spanish Civil War hides below this picturesque park.

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

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

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

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

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

An unassuming music museum recounts the rags to riches story of a dramatic Portuguese genre.

Dead weights honor the dead of Portugal's fishing industry.

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

Perhaps the most spectacular grotto along the Algarve coastline.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.

The current seat of the Parliament of Andalusia was once the epicenter of the Great Plague of Seville.

A 16th-century Andalusian palace.

The world's largest wooden structure.