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

The famed architect designed this Minnesota gas station of the future with a lookout tower.

This rare vessel mixed luxury with labor before being converted to a museum and sometimes haunted maze.

A Museum Dedicated to the Heroes That Fight Fire.

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

A bronze statue on a downtown corner honors Minneapolis's favorite career gal.

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

A museum dedicated to the exploring past, present, and future innovations.

This lab's maddening silence is good for business but bad for sanity.

Elevated freight railway turned wildly successful urban park.

The most confusing clock in New York.

An artist's cute bronze subway sculptures belie his violent artistic past.

Red frames showcase remnants of one of New York's original subway stations.

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

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

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

A popular European tradition makes its way to the states on one of America's most famous bridges.

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

A museum collection honoring the long history of the FDNY is held in a disused Manhattan fire house.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A bit of retro transportation flair preserved in the world's largest department store.