A marvel of Byzantine engineering under the streets of Istanbul.

World's largest crossword puzzle spans the side of a towerblock, its clues scattered throughout the city.

A vast city of the dead, where the deceased outnumber the living by more than a million.

The final resting place of the Emperor of the United States and Protector of Mexico.

Shop while you wait for a table in this tiny Indonesian eatery within a mini-mart.

The cuisine at this Sheepshead Bay spot tells the story of a displaced Muslim Chinese community.

This small New York museum examines Chinese history from its origins right up to its arrival in the city.

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

One of only two commuter aerial tramways in the United States.

Elevated freight railway turned wildly successful urban park.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

Home to the only outdoor municipal elevator in the United States.

World's only nuclear reactor operated by liberal arts undergraduates.

This sandstone mansion was the home of two of Oregon's most important pioneers.

This public art piece proves that in Portland even reporting the weather is a thing of whimsy.

10,000 flowered plants bloom in the City of Roses.

The longest burning light bulb in the world.

Its buzzing collection honors vibrator history.

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

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Playable, historic pinball machines fill this Alameda museum.

A living archive of urban activism and space reclaimed.

This former crime corner has been turned into an eclectic community center.

The earliest pagoda built in the beautiful Panmen Scenic Area of Suzhou.