A working miniature city designed to teach kids about safety and presumably city planning.

Steepest flood safety railway in the entire world.

The miraculous hydrant that saved the Mission District in 1906.

Church organ in the Philippines constructed out of bamboo.

One of the world's most definitive collections of musical instruments, spanning all cultures and historical periods.

Resonating tubes make music from highway overpass.

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

The Mighty Wurlitzer organ continues to belt out the tunes at downtown El Segundo's historic home for silent and classic movies.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

This sculpture is an instrument played by the swell of the seas.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

A large instrument played by the wind.

A Seussian sculpture made of brass instruments.

When the rain falls, this drain system turns into a musical instrument.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A whimsical sensor instrument for Minneapolitans to play on their walks to work.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

A musical instrument played by the sea.

This giant expressionist head crowns a museum devoted to a beloved Mexican leader.

A museum in the former home of Marxist revolutionary Leon Trotsky.

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

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

An airy Art Deco space devoted to the weird and wonderful folk art traditions of Mexico.