Follow the original medieval paths that wind through this intriguing section of the city.

This small chapel is built of human bones and decorated with a golden skeleton.

Once the largest unsupported dome in the world, beating out the Pantheon and St Peters in Rome.

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

One of the oldest amusement rides in existence was a huge disappointment to its creator.

A typographic tribute to the many comedic greats who make Great Britain laugh.

The medieval-looking hammer beam teak roof may be a Victorian vanity, but it's still absolutely magnificent.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A controversial memorial at the place where Captain Cook met his violent end.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

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

Watch the newest land on the planet form before your eyes.

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

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

65 million-year-old chalk outcroppings mark the end of the Jurassic Coast.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".