Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Built to celebrate the glory of a new queen, this forgotten monument has moved around Madrid three times, reflecting 200 years of political whims and city redevelopment.

An ode to the famous Las Vegas signage.

The magic of Spanish aviation housed under one roof.

A statue commemorating the island's tradition of dancing dwarves in Napoleon hats.

A thorough look at the development and history of the underground's rolling stock of the Madrid subway system.

The world's largest single-aperture telescope resides in the Canary Islands.

Several petroglyphs are all that remain of an ancient pyramid.

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

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

The four-story mural is the centerpiece of a lavish hotel's lush atrium.

Stop by, and you'll receive a map to two well-preserved ancient petroglyph sites.

This unassuming bookstore in the heart of Madrid is one of the oldest in Spain.

Marvel at this massive waterspout fueled by the incoming tide.

This enormous censer uses a pulley system installed over 400 years ago.

This enchanting green space houses a labyrinth lined with toxic plants.

Guitarist Paco de Lucía overlooks travelers as they pass through this train station dedicated to his legacy.

This 47-story "M" needed 20 years to be completed

This mountaintop observatory is home to one of the world's largest reflective telescopes.

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

Stormy conditions send jets of seawater bursting through holes in the cliffs.

Geological storytelling.