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.

Its humdrum facade only adds to its electrifying appeal: a rooftop with panoramic views of a shapeshifting metropolis.

Buy your fish and have it cooked to order in this bustling, eight-floor seafood market.

A serene space tucked amid the skyscrapers of Hong Kong's bustling financial district.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Rhode Island's tallest building bears a resemblance to the "Daily Planet" building and has been empty for more than five years.

An architectural statement of artistic intent smack in the middle of Providence, Rhode Island's Colonial uniformity.

Final resting place of one of the classic authors of horror literature.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.