A tribute to the twin ideals of religion and patriotism, built by a Catholic priest from rocks, glass, and innumerable found items.

This long unused shot tower on the Mississippi remains a point of pride for a small city in Iowa.

Ruins of an early Roman Christian church dating back to the 4th to 5th centuries.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

The site of many battles and tragedies, including the 40 maidens who leapt into the sea.

An ancient Thracian city where fire rituals were practiced on the largest cult altar in Southeast Europe.

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

This historic black and white monastery is one of Bulgaria's architectural jewels.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

300 years of pharmaceutical history on display.

"Medieval" castle built in the mid-20th century by one family.

This castle played host to the largest great hall found in medieval Central Europe.

A 13th-century convent where St. Margaret of Hungary spent her teenage years.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

The remains of an entire Roman city can be explored in this interactive museum.

One of the largest barracks of the Austro-Hungarian monarchy's military is now an abandoned ruin.

A collection of intricate sculptures so small they have to be seen through a microscope.

Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Everything from miniature biblical scenes to life-sized statues are almond-based at this sweet and nutty gallery.