A natural gas leak provides a flickering flame beneath a waterfall.

An old abandoned mining town in The Adirondacks where Theodore Roosevelt first learned of the shooting of President William McKinley.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

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

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

An eerie, derelict amusement park in Berlin.

Berlin's old airport.

Secluded amid upstate New York’s Adirondack Mountains lies this subterranean emblem of a nation on the brink of nuclear war. And it's for sale.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground