A sea cave with a waterfall and Viking past

The mystery of this small, brick pond eluded its possibly only investigator until his death.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

A mysterious monument where a woman who records say never existed was burnt alive for being a witch.

This waterfall is one of the most spectacular natural features in the Scottish Lowlands.

Britain's only herd of free-ranging reindeer.

A mysterious carving from 17th-century London seemingly depicts a young boy sitting on a bread basket.

This pub has roots dating back to 1430 and serves as the setting for multiple Charles Dickens stories.

The pockmarks across the building's facade are remnants of the Blitz.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

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

Eighty million natural history specimens call this gargantuan museum home.

The tea room that pushed the boundaries of adorable straight into... we can't find the words.

Tiki luxury on Nob Hill.

The home of aviation trailblazers, in a remote corner of the big city.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

This long unused shot tower on the Mississippi remains a point of pride for a small city in Iowa.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

This opulent Pueblo Deco movie palace melds Art Deco and Native American motifs.

In the middle of a busy airport, a statue honoring the astronaut who told Houston that Apollo 13 had a problem.