This Ukraine alleyway has become its own little island of forgotten things.

This attraction was abandoned after the Chornobyl disaster.

This derelict superstructure was a very important warning system for the Soviet military.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

One of the most poignant ruins of the Chornobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

A tilted half-timbered house from 1672 is built into a salvaged segment of a medieval wall.

This rare basilica nestled right in downtown Asheville is an architectural marvel, inside and out.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Fantastic views and thousands of love locks.

From Nazi chemicals to the CIA, this architectural marvel has played a fascinating role in German history.

One of the world's heaviest musical instruments towers within a popular urban park.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

This sublime architectural marvel is a rare example of an expressionist church.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

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

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

Monumental sculptures guard many of the graves, transforming this necropolis into an open-air fine art museum.

A fortress built to pacify local uprising that had a stint as a Nazi concentration camp before becoming a five-star hotel.

A sharp sculpture made of thousands of pieces of jagged glass.

Little Red Lighthouse under the George Washington Bridge.

Visit the monolithic tomb of America's most famous general.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The "Seinfeld" diner.