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

The final resting place to 300 Victorian-era pets hides inside the city park.

Hear the quietest sound from across the dome.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

Famously misunderstood wonder of the ancient world

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

An oasis of shade and color amidst the bustle of the old city.

A more chill but no less fascinating version of the famous ancient archeological site.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Just outside of Jordan's capital lies an ancient castle and intriguing caves dating back to the Copper Age.

This exceptionally well-preserved ancient marvel also houses a small museum dedicated to Jordanian folk tradition.

The most gigantic, swoony, intimidating trio of fingers in all of antiquity.

A large-scale steel sculpture entitled 'The Shadow Boxer' pays tribute to Nelson Mandela.

One of the tallest buildings in Africa provides a great view of Johannesburg's unique geography.

Home to some of the oldest hominid fossils ever found.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

Known for centuries as the famous Roman emperor's burial place, this monument is actually something else.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

This curious, round temple is the oldest still-standing marble building in Rome.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.