This king penguin is a knighted brigadier of the Norwegian Army.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

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

The commemorative stone column conceals a secret laboratory.

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

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

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

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

The grounds of this Jacobean estate contain one of the oldest mulberry trees in England.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

A historic hill of tall tales, with one rather special tree.

This museum inside a museum tells the story of London's timepieces.

A relic of Victorian grandeur hides beneath a busy South London road.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

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

Eclectic final resting place of the controversial explorer.

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

A network of concealed passageways lies within a busy London Underground station.

An old department store turned Nazi prison turned artist commune.

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

Fall down the rabbit hole into a surreal journey of human consciousness "from ass to soul."

This classic restaurant features a gorgeous mirror-clad room.

This sprawling Jewish cemetery is one of the largest in Europe.