The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

An unoccupied lighthouse encased in layers of ice from the waters of Lake Erie.

A wonderful and easily overlooked museum tucked in Ohio's Burke Lakefront Airport.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

The only depiction of Abraham Lincoln holding a weapon, and the names of all 9,000 Cuyahoga veterans of the Civil War.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

On the Hudson resides one of the largest clocks in the world.

A collection of art from Bulgaria's time as a communist state.

A sweet symbol marks the place where torturous executions were once carried out.

Sofia's legislative center is continuously reinventing itself.

"Unity, Creativity, Beauty."

An homage to the medieval rulers of Bulgaria.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

An abandoned saucer-shaped monument in the Bulgarian mountains.

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.

Eastern Bloc nostalgia, anybody?

A striking symbol of the Bulgarian capital.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

The world's largest military aircraft cemetery.

Flaming barrels of tar race through these village streets on Bonfire Night, a tradition that dates back centuries.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

An homage to everyone's favorite prehistoric cartoon family.