A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

A marine aquarium with an astounding variety of fish hides in the basement beneath the famous Palm House.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

Some of England's last cave dwellers lived and worked within this huge cave.

Angels, demons, and tortured souls on a giant wall mural in a little church.

The small bright red pillar survived the 1996 Manchester bombing virtually unscathed.

Be on the lookout for the symbolic insect all over the city.

London's marvelous wildfowl reserve along the Thames.

A stone obelisk towering over the surrounding countrysides beckons hikers across the rolling moors.

A gallery specifically dedicated to the botanical illustrations of a remarkable traveling lady.

The 5,000-year-old megalith is believed to be Scotland's tallest standing stone.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

The British monarchy's stamp collection is one of the most impressive in all of Europe revealing generations of royal nerdery.

It's possible to walk inside one of the largest Neolithic tombs in Britain.

The Tudor-style cottage in the middle of the square is not quite what it seems.

The discovery of this Neolithic settlement, which contained a Stone Age "cathedral," threw archaeologists for a loop.

This neolithic stone grave has been altered and restored so often its now more neo than lithic.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

An optical Illusion once believed to be an electrical phenomenon.

The smallest pub in Britain was once a cabinet of curiosities and it still has the dead cat to prove it.

The Origin of On the Origin of Species.