The longest and steepest staircase locks in the United Kingdom.

This church is considered the largest and most complete Saxon church in England.

Home to Alan Turing, the cracking of the Enigma code, and Captain Ridley's shooting party.

Isaac Newton's former home, where the famous apple tree still stands.

This iconic building was founded as a school for the impoverished, but became one for the sons of the local gentry.

The longest and tallest aqueduct in Britain can actually be sailed across.

At 1,732 feet above sea level, this spectacularly isolated yet surprisingly bustling bar is the highest pub in Britain.

A historic Georgian building and warm springs.

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

Semi-precious Blue John stones have been mined in this cavern system for centuries.

A magnificent winding road through a steep valley, with deep natural caverns at the bottom

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

This volcanic plug boasts the longest recorded history of any Scottish stronghold.

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

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

A remarkable feat of Victorian engineering across the Firth of Forth.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

Romania's triumphal arch looks out over Bucharest.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

An entertainment center in a huge transparent tent.

A modern tower, symbolizing the legend of a golden egg on top of the tree of life.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Hans Christian Andersen for the postmodern world.