The remains of a grand castle that may have inspired Bram Stoker's Dracula.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A 19th-century architectural wonder designed by the "father of the skyscraper."

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

The most powerful laboratory radiation source in the world pulses with 1,000 times the electricity of a lightning bolt.

Look closely and you’ll notice that the color changes a third of the way up the tower.

This whimsical campus lawn is dotted with large sculpted numbers and hidden mathematical formulas.

World's largest Christmas store.

The world's largest anatomically accurate brain sculpture.

Former self-sufficient mental institution now a planned community.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.