In Egypt's expanding metro area, many of the neighbors are dead.

What was once a unique system of urban elevators is turning into a mechanical ruin.

Pivotal home of Nobel Prize winner Pablo Neruda.

Quite simply the largest tree in the world (by volume).

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A small but immensely extravagant palace built by the "Night King."

The fairy tale castle of the "fairy-tale king."

A decommissioned Naval base now rents itself out for people who want to blow stuff up.

The oldest U.S. Government building in California, and it's State Historic Landmark #1.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

The rusting remains of the largest assembled WWII fleet on the West Coast.

Cold war icon and onetime "hole" in the iron curtain.

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

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

A library built during San Francisco's pioneer times is a student's retreat, bibliophile's sanctuary, and chess player's delight.

Faceless white figures loom over the city from the rooftop.

One-time largest man-made structure in the world will be a park in 30 years.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.