Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This is one really big nut.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Steep canyon walls hide a forested oasis in the West Texas desert.

The highest point in Texas is capped by a big silver pyramid.

A Prada store in the West Texas desert that is never open for business.

With print dying, this local paper keeps the lights on by doubling as a stunning cafe and cocktail bar.

This quirky outpost and gallery inside a former church is an unexpected trove of handcrafted art.

A little stop along the Texas highway where Rock Hudson, Elizabeth Taylor, and James Dean stayed while shooting the 1955 film "Giant."

This titanic steel chain linking two buildings was installed without permission but instantly beloved.

Although resembling a grand Buddhist temple, this structure is actually the largest mosque in China.

These picturesque structures speckle the hill above the monastery.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

This stunning 15th-century royal hill fort preserves the age of chivalry in Rajasthan.

Hidden in the shadow of a rocky fortress is one concubine’s long-forgotten legacy.

Once an indicator of social class, the color blue has come to define this city on the edge of the Thar Desert.

The world's second-largest sundial, made entirely out of stone.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Museum devoted to the artificial language of Esperanto.

Baroque celebration of the end of the Great Plague of Vienna.