Places meltingknight Wants to Go

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

A spoke-tacular artwork constructed from recycled bicycle rims.

The decommissioned submarine is now the symbol of a small, inland Australian town.

This ancient Chinese observatory still contains early astronomy technology.

Tiny observatory made big contributions to the study of the Earth's motion.

This 3,800-year-old site contains markers used to study the movement of the sun and moon and create a lunar calendar.

One of only five observatories in the world built to measure the Earth's wobble.

A mysterious architectural gem in one of the most elegant areas of Buenos Aires.

This historic abandoned train station looks like a stop for ghost trains.

This steel sculpture made from a recycled crane towers above a former shipyard.

This eye-catching roundabout sculpture commemorates one of England's best World War II-era "shadow factories."

This striking sculpture of Icarus honors Greece's fallen flyers.

In the absence of a Chinese-language newspaper, for years the community posted daily updates on this simple bulletin board.

Authentic gondola hanging from the ceiling, notable mural in the back room.

An office built to look like a giant basket.

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

A moody and picturesque riverside ruin overgrown with vegetation.

One of the last few period-correct, hand-operated canal locks in the country.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

This dramatic rail curve was once the target of a failed Nazi attack.

In the middle of a suburban Denver neighborhood is a cave that once provided solace for a prominent Ute chief and his family.

Fortified homes of highland warriors that are still in use today.

Small church on top of a huge rock column.