The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

Christ's blood preserved in a Belgian town.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Sacred Buddhist home of some spiritual monkeys.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."