The television series' iconic giant foot was borrowed from this classical painting.

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

A mysterious artist-run cabinet of curiosities and library.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

Remnants of a Victorian garden feature sitting in public woodland.

Catacombs turned marketplace.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

A kaleidoscopic warehouse-maze of handmade neon signs.

Hidden deep in a forest is this geological wonder carved by glaciers.

Crawling into this primordial cave may feel disconcertingly familiar.

Collection of nearly 500 concrete figures sculpted by the late Veijo Rönkkönen.

This endearingly discomfited urinating statue commemorates the sneaky pees had by us all.

Legend has this precariously placed rock was placed by giants. Science has another explanation.

Menacing or in memoriam, the Silent People and their meaning are left to interpretation.

This fantastical icy castle is built anew every winter.

A subterranean house of worship carved right out of the bedrock.

Spain's largest bullring offers a unique glimpse at architecture and history.

The world's largest wooden structure.

The final resting place of the great navigator, or maybe his brother.

Just like in Hollywood, Madrid has also a forgotten walk of fame.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.