Triangular House built on a leafy residential street in St. Paul.

These curious caverns have been home to mushrooms, gangsters, and disco.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

Thousands of people walk over this fantastic work of art every day, but how many notice it?

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

A hands-off space for graffiti artists to hone and display their skills.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

The dairy farm in upstate New York where nearly half a million people gathered for three days of peace and music in 1969.

A building so large that it has its own weather.

A Florida college boasts the world's largest single-site collection of structures designed by Frank Lloyd Wright.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Elevated freight railway turned wildly successful urban park.

This statue intended for children to enjoy became a minor political spat.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

The site of Paul Revere's historic two lantern warning.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

An enormous, inside-out glass globe built in 1935.