A semi-scholarly approach to sex.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Neighborhood in Jerusalem is home to the ultra-orthodox haredim.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

These numerous Israeli caves were dug out over hundreds years for reasons ranging from hideouts to burial sites.

This lakeside tower is the third attempt at getting a tourist destination to stick on the spot.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

This peaceful, round shrine in the middle of the Sri Lankan jungle acts as a beacon of peace.

This elaborate temple was built around one of the Buddha's teeth.

An ancient stone fortress considered by many to be the eighth wonder of the world.

This historic Melbourne bullet factory is fully encased in a massive glass and steel cone.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This working class sculpture pounds his hammer all the livelong day.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

What's that on the side of that building? Va Va Voom, it's Bettie!

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

One man's psychedelic fence is painted with his cacophonous folk art musings on the world.

This nearly endless university hallway is home to a unique sunset known as "MIThenge."

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.