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

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

A unique seaside cave where Aleister Crowley faked his own death.

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.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

The world's oldest bookshop still in operation.

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

Houses are tucked between, on, and underneath giant boulders.

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

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

The sculpture of the deceased cockatoo flops atop its personal plinth.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

A famous burial ground with a history both grim and literary.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

The monster at the center of the Darwin Center Spirit Collection.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

Abstract dinosaur models in London.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

A kaleidoscopic warehouse-maze of handmade neon signs.