A beloved tribute to the Fab Four and the freedoms they inspired.

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

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

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

The abandoned summer estate of the former Greek Royal Family.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

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

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Where commuters walk through remnants of an ancient Greek necropolis.

One of the world's tallest statues is also one of its most hated.

Moscow's imposing monument to the Space Age.

A sculpture park of the tossed aside relics of the USSR, from Stalin to a massive Soviet emblem.

Museum celebrating the achievements of the Soviet space program.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

A small and surprising passageway in Saint Petersburg devoted to the Beatles.

Perhaps the tiniest sculpture in Saint Petersburg is a little bronze finch inspired by a song.

Specimens collected by the author of "Lolita" and self-taught lepidopterist are exhibited in his childhood home.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

Nonprofit art center that promotes outsider, intuitive, and self-taught art.

The world's largest anatomically accurate brain sculpture.

This towering totem holds the title for the tallest in the world but only according to some.

If astronomy had a ghost, it would look like this observatory.

Tucked away in the forests of Indiana resides an abandoned waterslide that is now a popular graffiti haunt.

The longest navigable underground river in the United States is home to countless blind and albino animals.