A marvel of Byzantine engineering under the streets of Istanbul.

Nature took her revenge on the "Wickedest City in the World."

Half-drowned wooden stumps and stone blocks are all that remain of a Victorian landing that was destroyed by storms.

Hidden just under the waters around this Turkish island are the ruins of a once great city.

A cemetery and the town it served sinks beneath the sea during the volcanic birth of Mt. Vulcan.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

This Tuscan lake hides a 13th century town that is still visible when the water recedes.

More than a century of radio history is told in these displays.

Medieval irrigation channels built into the sides of mountains provided Valais with water for hundreds of years.

A collaboration of art and ornithology mourns the calls of Sydney's lost birds.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

The history of radiation is on safe display at the foot of a radiation science laboratory.

Hidden in the hills is a mysterious stone structure, known only to a few.

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

The longest living non-clonal organisms on Earth.

Step into the cool deep past and unknown future of who begat who.

Europe’s oldest natural human mummy.

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

Home to Hollywood history and a very special salt crystal.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

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

Cold storage for agricultural biodiversity.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.