Northern Ireland's Brobdingnagian stepping stones.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

The atmospheric road was never meant to be so creepy.

The narrowest street in Paris.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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

Elaborate tile work in this railway station tells the story of Portugal.

The stunning interior of this Gothic church is covered in ornate gold details.

A hidden three-foot-wide house separates these two regal churches.

A controversial cenotaph dedicated to a local physician with an unscrupulous past.

A historic fortification critical to Anglo-Scottish conflicts now serves as a bed and breakfast.

This statue stands as a message against the ills of Apartheid.

The remnants of a facade from a 19th-century market stall emporium.

The beloved war-time celebrity spent time in the area before retiring to the Edinburgh Zoo.

A shiny sculpture celebrating the mighty mollusk.

The last remaining bottle-shaped kilns in Scotland stand alone in an Edinburgh suburb.

This was once a hall in which a 16th-century royal banquet was hosted by King James VI of Scotland.

An iconic red telephone box turned tiny art gallery.

It's a mystery how these curious columns wound up in an Edinburgh suburb.

A six-ton wedding present for the King of the Scots.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

The location of a citizen uprising that led to a gruesome act of mob justice.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.