A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

A much-maligned monument to teetotalism.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

At 207 feet, one of the world's longest continuous escalators.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

The ancient latrines of the Greeks, in all their public glory.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Go inside to really appreciate this 500-year-old technological masterpiece.

Longest fortress system anywhere in Europe.

An ancient knight and a symbol of the city's freedom.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

A haunting tribute to pioneering photographer Clover Adams.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Gargoyle head that brings good luck.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This iconic fortress was once the crown jewel of Haiti's national defense.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Resting place of the Texas A&M canine mascots, who watch the game from the grave with their own miniature scoreboard.

Tracks near this Texas nature site were once thought to support the Creationist belief that man and dino coexisted.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

WWI hospital ship lost in a cyclone turns up on the coast of Fraser Island, where she remains rusted and forgotten.