A fountain standing as a testament to a doomed alliance.

A marvel of Byzantine engineering under the streets of Istanbul.

A six-ton wedding present for the King of the Scots.

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

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Only hotel where you can legally launder money.

A walk through the historic city center, under the streets of Seattle.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The first declared National Monument in the United States.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

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

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

A 16th-century horror show built in a lovely Italian garden.

The glowing blue Nymphaeum of Emperor Tiberius.

Launchpad for the US military’s dead mouse operation to battle millions of snakes.

Open-air museum with an elaborate sculpture garden, stretching for over 70,000 square-meters.

Legend holds eating just one of these black eggs can add seven years to one's life.

Model Trains and Much More in Hamburg.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

Baroque celebration of the end of the Great Plague of Vienna.