The ancient tomb acts as a calendar that keeps perfect time.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

Peek through the gates at this oasis from the city, full of Old English charm.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

Sniff the Titan Arum's rotting flesh.

A very classy 1920s-era bar right in Grand Central Station.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

The "Seinfeld" diner.

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

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Mysterious 500-year-old tapestries depict a unicorn hunt.

A legendary speakeasy bookstore returns from the brink.

Ride the subways of yesteryear.

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

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

A dilapidated dock tells the story of Titanic's missed arrival.

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