An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The world's oldest optical museum is an odd collection where the exhibits look at you.

Eighty million natural history specimens call this gargantuan museum home.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

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

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

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

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

Pagan monument converted to Christianity with the population.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

Commonly acknowledged as the only public monument to the Devil himself.

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

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

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

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

This crumbling Portuguese ruin overlooks the populace it once ruled.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

A small Portuguese cottage formed between boulders in the countryside.