Along a California highway is a kind of Jurassic Park made of metal.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

The rustic cabin-like decor of this Arts and Crafts-style church reflects the love of nature central to its little-known theology.

The quirky salon doubles as a retro museum run by the world's leading "hairstorian."

The overgrown ruins of a once thriving World War I-era copper mine.

Twenty-three trees, each paired with a basalt stone, line a street in Chelsea, continuing an urban project started by German Fluxus artist Joseph Beuys.

A common entry point to the Griffith Observatory trail holds its own wonders.

The Hopi-style structure was built by the man who discovered Desert Hot Springs' famous mineral water.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

An overlooked memorial honoring the local Washington residents who died in World War I.

There’s a hidden military meme engraved on the World War II Memorial.

This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

This nine-story building is the oldest standing skyscraper in D.C.

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

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.