Largest lake in Great Britain measured by surface area.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

The maze-like transportation hub contains abandoned areas, derelict stores, and a resident bat colony.

Inside this art museum resides one of Glasgow's most famous musical instruments.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The ritual has been performed uninterrupted for nearly 700 years.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

A tribute to an explorer and naturalist often overlooked by history.

Eighty million natural history specimens call this gargantuan museum home.

Hidden beneath the streets of London is a secret subway that only carried mail.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

360° views of the city plus five floors of optical illusions and hands-on science.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

After over 100 years out of service this landmark windmill once again turns as a symbol of Jerusalem's self-sufficiency.

This nightmarish children's plaything was left grotesque to help kids conquer their fear.

This amazing ancient cave was kept secret for seven years to protect it from the public.

The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

This medieval city gate is now a blend of the past and the modern world.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

Ancient snack bar of the Roman Empire re-opened.