This French colonial post office is arguably the grandest in all of Southeast Asia.

The dramatic remains of an abandoned farmhouse sit high on the edge of a remote hillside.

A steep and winding road in the Yorkshire Dales passes by these deep natural potholes.

A winding medieval path was used by mourners to carry their dead to the nearest church.

Bombed and burned, this monument represents the often controversial ties between Vietnam and Cambodia.

This macabre monument atop an ancient well gives a nod to a brutal episode in Scottish clan history.

Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

Meant to be a lavish presidential home, the palace became a symbol of the fall of South Vietnam.

One of two Irish-style round towers in Scotland, this structure has mysterious origins.

This hidden collection of everyday objects illustrates life within communist Poland.

A group of glacial erratic boulders are improbably balanced on white limestone pedestals.

This Georgian Gothic building was created to shelter and feed deer.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

A small Scottish town's larger-than-life tribute to the celebrated accordion player.

A palatial former bank building now houses what may be the poshest art venue (and former Tesco) in Belfast.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

A poignant memorial shows the widows and children left heartbroken by the worst fishing disaster in Scottish history.

Follow the original medieval paths that wind through this intriguing section of the city.

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

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

Belfast's namesake river still winds below the city center, hidden from sight.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.