A fortified city, home to a remaining population of five families

A hacienda that features all things uniquely Yucatán.

A museum devoted to the victims and the survivors of the most catastrophic fire in American history.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

This picturesque mansion has gone from opulent ruin to nature museum.

This unusual building straddles two countries.

The little house that stood up to a disastrous flood has become a symbol of perseverance.

A rustic house where intellectuals and investors tried to put an end to Cold War nuclear armament.

The final resting place of 121 victims of the RMS Titanic, 42 of which may never be identified.

Hunt for buried treasure in Nova Scotia.

An ever-changing gathering of crude wooden figures haunts the St. Lawrence River.

Three buildings constructed of over 25,000 multicolored glass bottles.

Iconic rock formations that allow for exploration during high or low tide.

Stone monument honoring a town founder has a witch-boot shaped stain and a curse to go with it.

Commemoration of a sea voyage gone mysteriously wrong.

A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.

Mosaics, storks, and brothels—this ancient city has it all.

A Spanish-style estate that has traded black ties for rock concerts.

A historic chapel filled with colorful murals and a colorful past.

A castle built for love, and abandoned due to heartbreak.

A swing to dangle you off the very edge.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.