Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

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

The famous artist couple lived and worked here, in two different houses separated by a bridge.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

66,000 pieces of art, donated by one of the world's richest men.

There’s a hidden military meme engraved on the World War II Memorial.

One of London's oldest houses contains a mixture of both old and modern features.

Victorian-era Londoners really wanted to believe this 17th-century cistern was actually an ancient artifact.

The cedar tree in Highgate Cemetery earned its title by accident.

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

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

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

A beautifully well-preserved ancient Roman villa.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.