Catacombs turned marketplace.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

Some of the clearest water anywhere in the world.

One of the world's largest Tesla coils.

Rainforest filled with record-holding eucalyptus.

Lured here by the promise of tens of thousands in gold, Jesse James started a quintessentially American trend of robbing trains in-motion.

An archival collection of over 2,200 case studies which includes human brain specimens and tumor specimens.

The heads of two giant mythological water horses honor Scotland's horselord past.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

This replica of the Greek structure is in the heart of Nashville.

Stonehenge has nothing on Castlerigg’s views.