Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

Read a book next to a Midtown waterfall.

These century-old townhouses contain some of the first car garages built in the United States.

A modern addition to the Greenpoint skyline.

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

A touching tribute to the "Queen of Soul."

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

A beautiful collection of architectural ornaments rescued from demolished New York City buildings.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

This secluded ruin was once a home for exotic plants.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

The home of aviation trailblazers, in a remote corner of the big city.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

A decommissioned military complex that's now a modern industrial park.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

This abandoned subway station can still be seen on regular commuter trips.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

Created by one of England's most prolific labyrinth designers, inspired by Bath city history.

Scattered throughout London are ancient remnants of the city's former bounding wall.