These bleak 800-year-old ruins were once the royal residence of choice for hunting in Sherwood Forest.

These docile dragons are ideal inhabitants for the conservatory greenhouses.

London's amazing modernist public square that never was.

The little-known second castle that William the Conqueror built in York.

The metal frame is all that's left of a wicker sculpture which once towered over the M5 motorway.

This innovative steam machine was no doubt the most famous of the pioneer locomotives.

Modern commuters still pass through this 2,000-year-old Roman archway.

The commemorative stone column conceals a secret laboratory.

This macabre painting of a Shakespearean scene looks like something out of a nightmare.

An architectural oddity hides in plain sight on this iconic London bridge.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

This historic franken-chapel is the oldest wooden church in the world, at least part of it.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

It is against the law to obstruct the view from the top of this English burial mound.

An unusual ode to the late Irish playwright, complete with a squiggly bust and coffin-shaped bench.

A miniature village mimics the surrounding buildings so well it includes itself.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

One of the greatest movie directors of all time lived and worked in this London flat from 1926 to 1939.

A plaque marks the underground site of one of London's "lost rivers."

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

These ornate arches show how the course of the River Thames has changed.