Rome's semi-secret peephole vista is also a former Crusader stronghold.

The massive cave church of Cairo's Zabbaleen community is one of the largest Christian churches in the Middle East.

Where a guard killed nine German prisoners during one of the worst 20th-century POW camp massacres in U.S. history.

It's safe—and permitted—to walk across these twin natural sandstone arches.

A proto micro-nation sometimes populated by artists, surrounded on all sides by a Utah most barren.

An Ancestral Puebloan ruin that appears to burst into flames in the sunlight.

This ghost town was once a cult-like religious utopian settlement.

The fifth-longest natural arch in the world, and the longest outside China.

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

A sculpture for the sun and stars, created by Nancy Holt.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

The beautiful behemoth is one of the largest trees of its kind in the United States.

A historic model village was gifted from residents of London to Melbourne as thanks for their help during World War II.

Abandoned bridge hidden deep in the San Gabriel Mountains.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

The nearly 200-year-old building displays a perplexing grammatical error.

A measuring mishap led to these artificial stone ladies losing their stomachs.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A cheeky architectural easter egg.

What was meant as an innocent piece of art has earned a reputation as the "mansplaining sculpture."

A glorious pub known for a spiteful printing feud and its famous typeface lost—then found—at the bottom of the Thames.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

A New Hampshire grave with a grudge.

This stretch of Canadian road was named after a nickname that stuck so hard the city had to keep it.