A nightmare for the claustrophobic lies hidden in Southeast Asia.

A battle between nature and architecture in the Cambodian jungle.

Towering basalt columns, a creation of fire and ice.

A rare view of a preserved Victorian science museum.

An unrealized dream to wirelessly electrify the entire Earth.

The longest burning light bulb in the world.

The rocks in this arid basin leave trails of movement behind them.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

This former stomping grounds of the most eminent astronomers of the early 20th century.

Every equinox this Maya pyramid puts on a spooky ancient light show.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

The ancient tomb acts as a calendar that keeps perfect time.

The longest living non-clonal organisms on Earth.

The clock that sets them all.

Native Americans built this circle of stones, which was used to predict astronomical events.

A preserved oak tree about 3,500 years old found in Riga, Latvia.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

A modern mechanical planetary system, part of a 10,000 year clock.

Cold storage for agricultural biodiversity.

A clock designed to run with perfect accuracy for 10,000 years.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."