This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

Sniff the Titan Arum's rotting flesh.

Ride the subways of yesteryear.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

There must be a pun in this haystack somewhere...

Elevated freight railway turned wildly successful urban park.

New York City's only preserved family home from the 19th century.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The past, present, and future of Russia's signature alcohol is remembered in the world's only museum dedicated to the starchy spirit.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

A historic observatory precariously perched at the "Top of Europe."

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

It houses the remains of a 17th-century version of the Titanic.

A subterranean house of worship carved right out of the bedrock.

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.

The Guardian of Tallinn.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

These ancient sacred grounds granted amnesty to those who managed to reach them.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

Tubing through a cave lit with glowworms is a magical underground experience.