These engineering masterpieces are a dominant feature of the Belfast skyline.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Cold war icon and onetime "hole" in the iron curtain.

A son-and-daughter meat market, hawked by mom and dad.

Bali's remote "gateway to heaven" is one of the most sacred places on the island.

Sacred waters rescued from the wrath of a volcano.

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

The name of this ancient Indonesian temple translates as "Elephant Cave" but it could be more accurately called "The Hellmouth."

Hindu temple of the dead home to hundreds of long-tailed macaques.

This tiny lake temple dedicated to a water goddess seems to float on the surface.

The little-known second castle that William the Conqueror built in York.

These remarkable cascades are the jewels of Upper Tees.

The dance of this huge clock is a magnificent and eerie commentary on good and evil in the history of humankind.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

This 16th-century house tells the city's history through old artifacts and quirky tales.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.