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

A cluttered and astounding collection of antiquities and curiosities.

An unusual round church in London with a Templar past.

A pair of club-wielding guardians stand watch over London's first public clock to feature a minute hand.

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

Rebuilt remains of a temple to Roman god Mithras.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

Eighty million natural history specimens call this gargantuan museum home.

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

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

Sip whey-based vodka at the first Native-owned distillery opened on a reservation in centuries.

Hidden on the 7th floor of a historic building, this Cajun spot features wall-to-wall bottles of hot sauce.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

This national park dedicated to the tallgrass prairie ecosystem still displays its military past.

A historic and oft-filmed prison stands in a Chicago suburb.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

Oversized statues are just the tip of this nostalgic Americana roadside attraction.

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

Former utopian colony based on the belief that the universe exists in a hollow sphere.

This kitsch eatery is chock-a-block with bric-a-brac.