This silent sentry in the crypt below a large Gothic cathedral is often knee-deep in water.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

Besieged by war, this castle ruin has crumbled into a peaceful picnic spot.

Eclectic final resting place of the controversial explorer.

The "Mona Lisa" of funerary art.

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

An early 20th-century bullring converted into a modern shopping center.

This cemetery features modernist statues as strange as its name.

This Funeral Hearse Museum represents the finest in cadaver transportation.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

This skewed English house has looked like it's going to fall over for centuries.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

Iconic red and white plaques show the creative names invented to navigate the city streets.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

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

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

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

An ancient water supply dating back almost 500 years can still be found standing in East Sussex.