The first park built over a freeway is a brutalist masterwork.

The watery grave of an impractical idea.

The red brick house where the father of rock 'n' roll wrote some of his classic hits.

A clock designed to run with perfect accuracy for 10,000 years.

A Victorian mansion, painstakingly reproduced to appear just as the the Munster's family home did on TV.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

An unrealized dream to wirelessly electrify the entire Earth.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Gold Rush-era tombstones line the park's paths.

The largest permanent Monopoly board makes one of the longest games even bigger.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

Half of a house.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

A large instrument played by the wind.

A hidden subterranean installation offers a view of the sky.

This family mausoleum is steeped in symbolism and looks more like a fantasy location than a grave.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

The restored and active Victorian-era final resting place of San Francisco.

Visible below the waves are memorials to the city's Gold Rush dead.