20,000 pieces in a Frank Gehry-designed building.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

The only arched bridge made of stone on the entire Mississippi River.

When flour explodes, it's not a pretty sight.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

An unfinished rail tunnel that has since been used to house cheese and bats.

Whether you're up or down, the Elevator Museum is worth a stop.

Visit the monolithic tomb of America's most famous general.

A crumbling hospital from the 1850s on Roosevelt Island.

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

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

Peek through the gates at this oasis from the city, full of Old English charm.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.