Elevated freight railway turned wildly successful urban park.

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

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

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

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

Two cannon-like cranes were installed on top of the bank building to fend off bad feng shui.

This bridge made famous in a novel and on-screen wasn't actually built over the river Kwai.

Six times a day a train runs right through the middle of this Thai street market, sending vendors scrambling.

Singapore's landscaping project is home to 18 incredible Supertrees.

This colonial fort is an intriguing example of Renaissance military architecture.

Strolling through these vintage locomotives offers a surprising amount of insight into the history of Kenya.

This one-time health resort was used by aristocrats around the world.

This abandoned Slovenian military barracks has become a punky-political art squat.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

A striking symbol of the Bulgarian capital.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

360° views of the city plus five floors of optical illusions and hands-on science.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.