An artsy hidden staircase leads to breathtaking views of San Francisco.

It looks like a whale, it's part of Yale, and it's best-known by a nickname you can probably work out for yourself.

The headquarters of the famous Yale society.

Panoramic views of the city of New Haven and the Long Island Sound, with a side of history.

This forgotten beach house built to look like a Frank Lloyd Wright masterpiece overlooks a hidden beach.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Be(w)ar(e) the moat around this historic Czech castle.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

A former squatter's paradise outside Prague.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This automated sculpture of two men peeing will spell out text messages with their micturition.

A mocking tribute to the past and modern leadership of Prague.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

The first museum in the world devoted to sexual gadgetry.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

Underwater restaurant at the coral reefs of Eilat.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

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

Six times a day a train runs right through the middle of this Thai street market, sending vendors scrambling.