The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

Elevated freight railway turned wildly successful urban park.

The abandoned coal loading dock is a canvas for unsanctioned art.

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.

The ghostly remains of an accidental sea.

Version of the French Riviera destroyed by the sea.

The sea once considered an ecological wasteland is now called "crown jewel of avian biodiversity" by scientists.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

An off-grid art installation that encourages its visitors to imagine a world without waste.

A hand-built folk art installation covered with messages of God's love.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A museum dedicated to exhibiting remarkable outsider art.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

Over the centuries, this island paradise has done it all, from providing monks with ecclesiastical respite to sheltering an exiled Leon Trotsky.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

A marvel of Byzantine engineering under the streets of Istanbul.

In this historic region, homes and churches are carved into ancient volcanic rock formations.