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

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

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

A lush indoor jungle fills this bustling Madrid transportation hub.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

This house's itty bitty size means no humans allowed.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Entire apothecaries are on display at this Lisbon museum, which explores the history of medicine.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

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

The odd depiction of the Virgin Mary and baby Jesus is rooted in the Catholic Church's eradication of Catharism.

Just across from the "Last Supper" painting is the famous painter's vineyard, a gift received for creating the masterpiece.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

Masterful ceramic fountain and map of the Pacific Basin.

The taxidermied remains of the "last wild grizzly bear in California" and of the symbol of the state of California.

America's oldest Italian restaurant is a San Francisco institution.

This turn of the century masterpiece has a mysterious goaty interloper.

This residential door allows San Francisco muggles a glimpse at the wizarding world.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

Golden Gate Park's historic collection of plants.