The tunnel that runs beneath this former inn was once a hiding place for enslaved people seeking freedom.

One of the last surviving C-97s sits in a field in front of a Wisconsin inn.

A fairytale art house in the middle of Wisconsin.

A bizarre house filled with an astounding array of collections.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

Puzzles within puzzles hide a golden treasure in this hedge maze.

The world's first museum dedicated to the work of game-changing naturalist Charles Darwin.

Although it has never been a secret ninja base, this shrine still has plenty of tricks up its sleeve.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

This 18th-century sundial was designed to calculate the date of Easter each year.

Claude Monet was baptized in this lavishly ornate Paris church.

The formerly unmarked grave of the noted Black American painter, who was a friend to James Baldwin.

Known as the "Fat Man of Maldon," Bright was a larger-than-life figure.

Inside this cathedral is a shoulder bone belonging to the Patron Saint of Scotland.

A rare and unique example of an 18th-century door latch calls this restaurant home.

A scattered trail of street art adds a pop of color to the city's stark structures.

This home on a quiet suburban street is completely covered with vibrant mosaics.

Traveling collection of amazing automata.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.