An inconspicuous suburban street corner is the site of San Diego's worst air disaster.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

An inconspicuous footbridge beloved by San Diego locals.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

Hackney's newest private museum and natural curiosity shop.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

The London pub overlooks where the Mayflower was moored before setting sail for the New World.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

The oldest natural aquarium in the United Kingdom.

Remnants of the Roman empire's northern frontier nestled in suburban Glasgow.

Wonderfully preserved Victorian factory, complete with a preserved steam powered engine house.

An eccentric aristocrat brought these Australian natives to their current Scottish home.

Enter the world under the hill at this ancient UK burial chamber.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

These wooden pipes were crucial to providing water to Medieval Edinburgh.

Now home to a drinking establishment, this building has a macabre history.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

The last manually operated turntable ferry in the world.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.