A unique underground structure dating back to the 1st century BC.

This historic stone gate tower is now just a lonely relic in the middle of a swamp.

The lost Latin words were reconstructed using the holes from the nails that once pinned them in place.

This hidden garden boasts amazing views of Lyon.

The top of society once luxuriated in this world-class hotel, which continues to impress, even in ruin.

This mountain trail inspired Nietzsche to complete his magnum opus.

A wonderful collection of fossilized dinosaurs and other creatures that roamed the landscape millions of years ago.

A Roman spa buried deep beneath the City of London.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

Artists and musicians now rule over this former rail station.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

One part local history, 99 parts gruesome haunted house.

A student driver's nightmare.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.