These ornate manhole covers were used for a now-forgotten purpose.

This slender three-story building has also had several famous residents.

Phil Mortillaro uses keys to bring art back to the Village.

A quiet and contemplative oasis in the middle of New York's bustle and riot.

Hidden behind a gate in Greenwich Village is a little farmhouse that once served as the writing studio of a bestselling author.

The stoutest tree in the world.

This sacred fig tree with a link to the Buddha is one of the oldest human-planted trees in the world.

The most remote tree in the world is more than 170 miles from its nearest neighbor.

See replicas of Europe's most famous cave paintings and even some of the animals that feature in the art.

An annual extravaganza of Broadway theater memorabilia.

A mysterious monument covered in a binary code marks the heart of tech.

Home to the "Circus" trees created by Axel Erlandson.

For roadside fast food, pull over at the giant orange.

Historical trolley restoration and operation at History San Jose, Kelly Park.

This spectrum of a star was observed by one of the world's most accurate spectrographs. 

One of the largest Marian shrines on the West Coast stands rather unexpectedly in Silicon Valley.

A window into a long-lost world, these colorful tiles advertise a long-defunct range of purgative teas, harmless smokables, and diarrhea cures.

Remote Honduran Islands with a colorful history.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

This graceful little figure is a one-of-a-kind version of the cherished character.

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

Whale bones, scrimshaw, and sperm oil make up just a part of this comprehensive collection of whaling history.

Spies, love letters, and ghost stories have all left their mark on this home-cum-museum.