This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Elevated freight railway turned wildly successful urban park.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

A lush green oasis in the middle of Chicago.

A hot dog stand where the heads are just as hot as the dogs.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

Illegal drag racing two stories beneath Chicago’s streets.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Historic medieval fortified city in southwest France.

Where commuters walk through remnants of an ancient Greek necropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

What once sat in the world’s spotlight is today a largely disused ghost complex.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

This legendary city has been a tourist attraction for centuries.

Monasteries on rock pillars, once accessible only by frayed ropes.