A legendary ghostly hound supposedly left dark marks on a place of worship.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

Once the legendary capital of the Dacian Kingdom, this city has been reduced to mere ruins.

These ruins once made up the capital of Lydia, where metal coinage was allegedly invented.

The world's oldest map of the holy land gives us a fragmented glimpse of the layout of biblical nations.

The largest collection of artifacts from the Olmec civilization, the mother culture of Mesoamerica.

The language and heritage of a nearly forgotten culture can still be explored in this Southern enclave.

Glasgow’s piece of the patron saint of love.

Figures of unknown origin carved into the surfaces of underground caves.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

This charming, hidden guild museum holds some 700 years of crossbow history.

Each summer, the migratory bats living beneath the bypass form "batnadoes" at dusk.

Special tunnels built so that frogs won't be killed when crossing the highway.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

A well preserved medieval fortress in Vojvodina.

While it now takes more than a dime to open an account this historic Brooklyn bank still displays the opulence of the gilded age in which it was built.

Now containing the bones of the actual conquistador, instead of someone else.

Beautiful Victorian buildings from L.A.'s forgotten architectural past.

An L.A. traffic island where the faces of locals have been carved into massive granite eggs.

This impressive clifftop temple was once at the center of an international custody dispute.

The quirky - and private - constructions of a secluded artist depict the house of God.

A stunning fountain depicting a mythological she-goat carved directly into the rocks on the grounds of a Renaissance palace.

A fascinating assortment of cave dwellings, medieval ruins, and sarcophagi are being devoured by the forest.

This colossal ancient jaguar sculpture was used as a vessel for the hearts torn from sacrificial victims.