The oldest skyscraper of Europe now stands dwarfed by the surrounding structures.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

The first piece of public art dedicated to LGBT rights.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

A collection of riverboats of the Spanish royal family in a quaint museum.

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

The former Mexican president kept the bullets that killed his predecessor on display in his home, now a museum.

The former Willingdon Airport started operations in 1929, in India's capital, Delhi. Now, it's used for maintenance runs and helicopter rides.

This Masonic lodge was the first major private building to be constructed in Washington, D.C. after the Civil War.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

The oldest operating roller coaster of its kind, the Montaña Suiza has been thrilling riders since 1928.

The eclectic observatory castle of a 19th-century astronomer and explorer.

This tiny river island switches sovereignty every six months as part of a rare, centuries-old agreement.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

A large collection of solar and night-time telescopes dot a small area on the Teide mountain range.

This unique rock formation is quite the local celebrity, although one day it may come crashing down.

Hundreds of caves once used to store grains and animal feed.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

The largest salt lake in the Sahara is mysteriously alluring.

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.