This unique building in the main square stands out among the city's typically Baroque architecture.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

After 400 years of being closed to the public, this monastery's underground tunnels and secret garden are now a museum.

This church is named for one of the most dramatic tales in the early Christian church.

A World War II-era sign in Valletta is a reminder of when Malta was besieged so severely that food needed to be rationed.

This sculpture meant to honor the bravery of the Indigenous Mapuche people of Chile proved controversial.

Where dogs like the rare "Fire-Tailed Border Cocker" run free on the mountainside.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

This subterranean disco dance club in a Cuban cave comes with bright lights and a dark legend.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Hundreds of notes give thanks to the patron saint of lost causes.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

A unique collection of Soviet military artifacts lies hidden away in a disused train, in the unrecognized Eastern European republic of Transnistria.

This 13th century Orthodox monastery is built right into the Moldovan cliffside.

Seventy-five miles of limestone caves host more than a million bottles of wine beneath a sleepy Moldovan town.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

The metal leaves on this tree are engraved with the names of Holocaust victims.

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

This village in Bohemian Switzerland hosts more than 300 wood carvings inspired by fairytales, folklore, and other oddities, as well as a series of Communist-era tanks

Macabre astrological automaton clock dating to the late 1400s.

A constellation of golden cobblestones shows the names of local children born under a full moon.

Hoodoos, naturally eroded land formations, stand 20 feet tall in the Canadian badlands.

As if T-rex wasn't big enough, this Canadian monument is four times larger than the real thing.